Updated 2 h ago

Vulnerability database

Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.

1,766exploited flaws on CISA’s list

36added in the last 30 days

585new WordPress flaws this week

391,310entries in the database

4,089 results · page 34 of 82

Dec 8, 2020Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker.CVE-2020-26958 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.1
Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. This could lead to a cross-site script inclusion vulnerability, or a Content Security Policy bypass. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2020OneCRL was non-functional in the new Firefox for Android due to a missing service initialization.CVE-2020-26957 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
OneCRL was non-functional in the new Firefox for Android due to a missing service initialization. This could result in a failure to enforce some certificate revocations. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 83.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2020In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS.CVE-2020-26956 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.1
In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2020When a user downloaded a file in Firefox for Android, if a cookie is set, it would have been re-sent during a subsequent file download operation on the same domCVE-2020-26955 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
When a user downloaded a file in Firefox for Android, if a cookie is set, it would have been re-sent during a subsequent file download operation on the same domain, regardless of whether the original and subsequent request were in private and non-private browsing modes. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 83.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2020When accepting a malicious intent from other installed apps, Firefox for Android accepted manifests from arbitrary file paths and allowed declaring webapp manifCVE-2020-26954 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
When accepting a malicious intent from other installed apps, Firefox for Android accepted manifests from arbitrary file paths and allowed declaring webapp manifests for other origins. This could be used to gain fullscreen access for UI spoofing and could also lead to cross-origin attacks on targeted websites. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 83.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2020It was possible to cause the browser to enter fullscreen mode without displaying the security UI; thus making it possible to attempt a phishing attack or otherwCVE-2020-26953 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
It was possible to cause the browser to enter fullscreen mode without displaying the security UI; thus making it possible to attempt a phishing attack or otherwise confuse the user. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2020Incorrect bookkeeping of functions inlined during JIT compilation could have led to memory corruption and a potentially exploitable crash when handling out-of-mCVE-2020-26952 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Incorrect bookkeeping of functions inlined during JIT compilation could have led to memory corruption and a potentially exploitable crash when handling out-of-memory errors. This vulnerability affects Firefox < 83.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2020A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization.CVE-2020-26951 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.1
A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2020In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition.CVE-2020-26950 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record packetstormsecurity.com bugzilla.mozilla.org
Nov 23, 2020Scratch Addons is a WebExtension that supports both Chrome and Firefox.CVE-2020-26239 · Other software · ScratchAddons · reported by GitHubHigh 7.6
Scratch Addons is a WebExtension that supports both Chrome and Firefox. Scratch Addons before version 1.3.2 is vulnerable to DOM-based XSS. If the victim visited a specific website, the More Links addon of the Scratch Addons extension used incorrect regular expression which caused the HTML-escaped values to be unescaped, leading to XSS. Scratch Addons version 1.3.2 fixes the bug. The extension will be automatically updated by the browser. More Links addon can be disabled via the option of the extension.
Product
ScratchAddons
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record github.com github.com
Oct 28, 2020When performing EC scalar point multiplication, the wNAF point multiplication algorithm was used; which leaked partial information about the nonce used during sCVE-2020-6829 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.3
When performing EC scalar point multiplication, the wNAF point multiplication algorithm was used; which leaked partial information about the nonce used during signature generation. Given an electro-magnetic trace of a few signature generations, the private key could have been computed. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Oct 22, 2020Mozilla developers reported memory safety bugs present in Firefox 81.CVE-2020-15684 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Mozilla developers reported memory safety bugs present in Firefox 81. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 82.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 22, 2020Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3.CVE-2020-15683 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.4, Firefox < 82, and Thunderbird < 78.4.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Oct 22, 2020When a link to an external protocol was clicked, a prompt was presented that allowed the user to choose what application to open it in.CVE-2020-15682 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
When a link to an external protocol was clicked, a prompt was presented that allowed the user to choose what application to open it in. An attacker could induce that prompt to be associated with an origin they didn't control, resulting in a spoofing attack. This was fixed by changing external protocol prompts to be tab-modal while also ensuring they could not be incorrectly associated with a different origin. This vulnerability affects Firefox < 82.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 22, 2020When multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten another's entry in a sharCVE-2020-15681 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
When multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten another's entry in a shared stub table, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 82.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 22, 2020If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-exCVE-2020-15680 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.3
If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 8, 2020During ECDSA signature generation, padding applied in the nonce designed to ensure constant-time scalar multiplication was removed, resulting in variable-time eCVE-2020-12401 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.7
During ECDSA signature generation, padding applied in the nonce designed to ensure constant-time scalar multiplication was removed, resulting in variable-time execution dependent on secret data. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Oct 8, 2020When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channCVE-2020-12400 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.7
When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Oct 1, 2020When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free.CVE-2020-15678 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free. This occurs because the function APZCTreeManager::ComputeClippedCompositionBounds did not follow iterator invalidation rules. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Oct 1, 2020By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original siCVE-2020-15677 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.1
By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Oct 1, 2020Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attackeCVE-2020-15676 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.1
Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Oct 1, 2020When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a potentially exploitable crash.CVE-2020-15675 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 81.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020Mozilla developers reported memory safety bugs present in Firefox 80.CVE-2020-15674 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers reported memory safety bugs present in Firefox 80. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 81.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2.CVE-2020-15673 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Oct 1, 2020When typing in a password under certain conditions, a race may have occured where the InputContext was not being correctly set for the input field, resulting inCVE-2020-15671 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgLow 3.1
When typing in a password under certain conditions, a race may have occured where the InputContext was not being correctly set for the input field, resulting in the typed password being saved to the keyboard dictionary. This vulnerability affects Firefox for Android < 80.
Product
Firefox for Android
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020Mozilla developers reported memory safety bugs present in Firefox for Android 79.CVE-2020-15670 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers reported memory safety bugs present in Firefox for Android 79. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 80, Firefox ESR < 78.2, Thunderbird < 78.2, and Firefox for Android < 80.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified.CVE-2020-15669 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified. This results in a use-after-free and we presume that with enough effort it could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.12 and Thunderbird < 68.12.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020A lock was missing when accessing a data structure and importing certificate information into the trust database.CVE-2020-15668 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
A lock was missing when accessing a data structure and importing certificate information into the trust database. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020When processing a MAR update file, after the signature has been validated, an invalid name length could result in a heap overflow, leading to memory corruption CVE-2020-15667 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
When processing a MAR update file, after the signature has been validated, an invalid name length could result in a heap overflow, leading to memory corruption and potentially arbitrary code execution. Within Firefox as released by Mozilla, this issue is only exploitable with the Mozilla-controlled signing key. This vulnerability affects Firefox < 80.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020When trying to load a non-video in an audio/video context the exact status code (200, 302, 404, 500, 412, 403, etc.) was disclosed via the MediaError Message.CVE-2020-15666 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
When trying to load a non-video in an audio/video context the exact status code (200, 302, 404, 500, 412, 403, etc.) was disclosed via the MediaError Message. This level of information leakage is inconsistent with the standardized onerror/onsuccess disclosure and can lead to inferring login status to services or device discovery on a local network among other attacks. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020Firefox did not reset the address bar after the beforeunload dialog was shown if the user chose to remain on the page.CVE-2020-15665 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Firefox did not reset the address bar after the beforeunload dialog was shown if the user chose to remain on the page. This could have resulted in an incorrect URL being shown when used in conjunction with other unexpected browser behaviors. This vulnerability affects Firefox < 80.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would CVE-2020-15664 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension. Combined with user confusion, this could result in an unintended or malicious extension being installed. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, Firefox ESR < 78.2, and Firefox for Android < 80.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 1, 2020If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privilegesCVE-2020-15663 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous version which would have allowed exploitation of an older bug and arbitrary code execution with System Privileges. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, and Firefox ESR < 78.2.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Aug 10, 2020A rogue webpage could override the injected WKUserScript used by the download feature, this exploit could result in the user downloading an unintended file.CVE-2020-15662 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
A rogue webpage could override the injected WKUserScript used by the download feature, this exploit could result in the user downloading an unintended file. This vulnerability affects Firefox for iOS < 28.
Product
Firefox for iOS
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Aug 10, 2020A rogue webpage could override the injected WKUserScript used by the logins autofill, this exploit could result in leaking a password for the current domain.CVE-2020-15661 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
A rogue webpage could override the injected WKUserScript used by the logins autofill, this exploit could result in leaking a password for the current domain. This vulnerability affects Firefox for iOS < 28.
Product
Firefox for iOS
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Aug 10, 2020Mozilla developers and community members reported memory safety bugs present in Firefox 78 and Firefox ESR 78.0.CVE-2020-15659 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers and community members reported memory safety bugs present in Firefox 78 and Firefox ESR 78.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Aug 10, 2020The code for downloading files did not properly take care of special characters, which led to an attacker being able to cut off the file ending at an earlier poCVE-2020-15658 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
The code for downloading files did not properly take care of special characters, which led to an attacker being able to cut off the file ending at an earlier position, leading to a different file type being downloaded than shown in the dialog. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org bugzilla.mozilla.org
Aug 10, 2020Firefox could be made to load attacker-supplied DLL files from the installation directory.CVE-2020-15657 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.8
Firefox could be made to load attacker-supplied DLL files from the installation directory. This required an attacker that is already capable of placing files in the installation directory. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org bugzilla.mozilla.org
Aug 10, 2020JIT optimizations involving the Javascript arguments object could confuse later optimizations.CVE-2020-15656 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org bugzilla.mozilla.org
Aug 10, 2020A redirected HTTP request which is observed or modified through a web extension could bypass existing CORS checks, leading to potential disclosure of cross-origCVE-2020-15655 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
A redirected HTTP request which is observed or modified through a web extension could bypass existing CORS checks, leading to potential disclosure of cross-origin information. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org bugzilla.mozilla.org
Aug 10, 2020When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are nCVE-2020-15654 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org bugzilla.mozilla.org
Aug 10, 2020An iframe sandbox element with the allow-popups flag could be bypassed when using noopener links.CVE-2020-15653 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
An iframe sandbox element with the allow-popups flag could be bypassed when using noopener links. This could have led to security issues for websites relying on sandbox configurations that allowed popups and hosted arbitrary content. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org bugzilla.mozilla.org
Aug 10, 2020By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect.CVE-2020-15652 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. This vulnerability affects Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Aug 10, 2020A unicode RTL order character in the downloaded file name can be used to change the file's name during the download UI flow to change the file extension.CVE-2020-15651 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
A unicode RTL order character in the downloaded file name can be used to change the file's name during the download UI flow to change the file extension. This vulnerability affects Firefox for iOS < 28.
Product
Firefox for iOS
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Aug 10, 2020Given an installed malicious file picker application, an attacker was able to overwrite local files and thus overwrite Firefox settings (but not access the prevCVE-2020-15650 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.5
Given an installed malicious file picker application, an attacker was able to overwrite local files and thus overwrite Firefox settings (but not access the previous profile). *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 68.11.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Aug 10, 2020Given an installed malicious file picker application, an attacker was able to steal and upload local files of their choosing, regardless of the actually files pCVE-2020-15649 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 5.5
Given an installed malicious file picker application, an attacker was able to steal and upload local files of their choosing, regardless of the actually files picked. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 68.11.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Aug 10, 2020A Content Provider in Firefox for Android allowed local files accessible by the browser to be read by a remote webpage, leading to sensitive data disclosure, inCVE-2020-15647 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.4
A Content Provider in Firefox for Android allowed local files accessible by the browser to be read by a remote webpage, leading to sensitive data disclosure, including cookies for other origins. This vulnerability affects Firefox for < Android.
Product
Firefox for
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Jul 9, 2020Mozilla developers and community members reported memory safety bugs present in Firefox 77.CVE-2020-12426 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers and community members reported memory safety bugs present in Firefox 77. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 78.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Jul 9, 2020Due to confusion processing a hyphen character in Date.parse(), a one-byte out of bounds read could have occurred, leading to potential information disclosure.CVE-2020-12425 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Due to confusion processing a hyphen character in Date.parse(), a one-byte out of bounds read could have occurred, leading to potential information disclosure. This vulnerability affects Firefox < 78.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org
Jul 9, 2020When the Windows DLL "webauthn.dll" was missing from the Operating System, and a malicious one was placed in a folder in the user's %PATH%, Firefox may have loaCVE-2020-12423 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.8
When the Windows DLL "webauthn.dll" was missing from the Operating System, and a malicious one was placed in a folder in the user's %PATH%, Firefox may have loaded the DLL, leading to arbitrary code execution. *Note: This issue only affects the Windows operating system; other operating systems are unaffected.* This vulnerability affects Firefox < 78.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.opensuse.org lists.opensuse.org

Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.

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