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.
11 results
Oct 8, 2026Magic: The Gathering Arena (Windows/Steam client; 2026.59.30.12801.127931.6 and certain later 2026.60.x builds) passes a server-supplied URL from a home-screen CVE-2026-107448 · Other software · Wizards of the Coast · reported by MITRELow 3.4
Magic: The Gathering Arena (Windows/Steam client; 2026.59.30.12801.127931.6 and certain later 2026.60.x builds) passes a server-supplied URL from a home-screen carousel GoToExternalUrl action directly to the Windows shell via Application.OpenURL/ShellExecuteW without validating the URI scheme or domain. A hypothetical attacker able to control the carousel content delivered to clients can cause arbitrary registered URI-scheme handlers to be invoked on client hosts with no user interaction. For example, one might expect that the carousel content only has https: URIs, not ms-calculator: URIs.
- Product
- Magic: The Gathering Arena
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
May 21, 2025An issue in Valvesoftware Steam Client Steam Client 1738026274 allows attackers to escalate privileges via a crafted executable or DLL.CVE-2025-27998 · Other software · reported by MITREHigh 8.4
An issue in Valvesoftware Steam Client Steam Client 1738026274 allows attackers to escalate privileges via a crafted executable or DLL.
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 10, 2021Valve Steam before 2021-04-17, when a Source engine game is installed, allows remote authenticated users to execute arbitrary code because of a buffer overflow CVE-2021-30481 · Other software · Valvesoftware · reported by MITREHigh 8
Valve Steam before 2021-04-17, when a Source engine game is installed, allows remote authenticated users to execute arbitrary code because of a buffer overflow that occurs for a Steam invite after one click.
- Product
- Steam Client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordnews.ycombinator.comtwitter.com
Jul 4, 2020An issue was discovered in Valve Steam Client 2.10.91.91.CVE-2020-15530 · Other software · Valvesoftware · reported by MITREHigh 7.8
An issue was discovered in Valve Steam Client 2.10.91.91. The installer allows local users to gain NT AUTHORITY\SYSTEM privileges because some parts of %PROGRAMFILES(X86)%\Steam and/or %COMMONPROGRAMFILES(X86)%\Steam have weak permissions during a critical time window. An attacker can make this time window arbitrarily long by using opportunistic locks.
- Product
- Steam Client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recorddaniels-it-blog.blogspot.comdaniels-it-blog.blogspot.com
Oct 4, 2019Valve Steam Client before 2019-09-12 allows placing or appending partially controlled filesystem content, as demonstrated by file modifications on Windows in thCVE-2019-17180 · Other software · Valvesoftware · reported by MITREHigh 7.8
Valve Steam Client before 2019-09-12 allows placing or appending partially controlled filesystem content, as demonstrated by file modifications on Windows in the context of NT AUTHORITY\SYSTEM. This could lead to denial of service, elevation of privilege, or unspecified other impact.
- Product
- Steam Client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordamonitoring.ruhabr.com
Aug 21, 2019Valve Steam Client for Windows through 2019-08-20 has weak folder permissions, leading to privilege escalation (to NT AUTHORITY\SYSTEM) via crafted use of CreatCVE-2019-15316 · Other software · Valvesoftware · reported by MITREHigh 7
Valve Steam Client for Windows through 2019-08-20 has weak folder permissions, leading to privilege escalation (to NT AUTHORITY\SYSTEM) via crafted use of CreateMountPoint.exe and SetOpLock.exe to leverage a TOCTOU race condition.
- Product
- Steam Client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordamonitoring.ruhabr.com
Aug 21, 2019Valve Steam Client for Windows through 2019-08-16 allows privilege escalation (to NT AUTHORITY\SYSTEM) because local users can replace the current versions of SCVE-2019-15315 · Other software · Valvesoftware · reported by MITREHigh 7.8
Valve Steam Client for Windows through 2019-08-16 allows privilege escalation (to NT AUTHORITY\SYSTEM) because local users can replace the current versions of SteamService.exe and SteamService.dll with older versions that lack the CVE-2019-14743 patch.
- Product
- Steam Client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordxiaoyinl.github.ioxiaoyinl.github.io
Aug 7, 2019In Valve Steam Client for Windows through 2019-08-07, HKLM\SOFTWARE\Wow6432Node\Valve\Steam has explicit "Full control" for the Users group, which allows local CVE-2019-14743 · Other software · Valvesoftware · reported by MITREMedium 6.6
In Valve Steam Client for Windows through 2019-08-07, HKLM\SOFTWARE\Wow6432Node\Valve\Steam has explicit "Full control" for the Users group, which allows local users to gain NT AUTHORITY\SYSTEM access.
- Product
- Steam Client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordamonitoring.rugithub.com
May 20, 2019In Valve Steam 1528829181 BETA, it is possible to perform a homograph / homoglyph attack to create fake URLs in the client, which may trick users into visiting CVE-2018-12270 · Other software · Valvesoftware · reported by MITREMedium 5.4
In Valve Steam 1528829181 BETA, it is possible to perform a homograph / homoglyph attack to create fake URLs in the client, which may trick users into visiting unintended web sites.
- Product
- Steam Client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Nov 24, 2015Valve Steam 2.10.91.91 uses weak permissions (Users: read and write) for the Install folder, which allows local users to gain privileges via a Trojan horse steaCVE-2015-7985 · Other software · Valvesoftware · reported by MITREHigh 7.2
Valve Steam 2.10.91.91 uses weak permissions (Users: read and write) for the Install folder, which allows local users to gain privileges via a Trojan horse steam.exe file.
- Product
- Steam Client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordpacketstormsecurity.comsecurityfocus.com
May 20, 2015The client detection protocol in Valve Steam allows remote attackers to cause a denial of service (process crash) via a crafted response to a broadcast packet.CVE-2015-4016 · Other software · Valvesoftware · reported by MITREMedium 5
The client detection protocol in Valve Steam allows remote attackers to cause a denial of service (process crash) via a crafted response to a broadcast packet.
- Product
- Steam Client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordstore.steampowered.comsecurityfocus.com
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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