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.
20 results
Aug 5, 2026OpenPLC Runtime v3's compile_program function (webserver/openplc.py) parses directives from uploaded Structured Text (.st) program files and writes the referencCVE-2026-71268 · Other software · thiagoralves · reported by 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2cCritical 9.9
OpenPLC Runtime v3's compile_program function (webserver/openplc.py) parses directives from uploaded Structured Text (.st) program files and writes the referenced content to with no validation that file_path stays within the ./core directory. A path-validation function, validate_file_path, exists elsewhere in the codebase (webserver/credentials.py) but is never invoked from compile_program, leaving the sink unprotected.
- Product
- OpenPLC_v3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 18, 2026OpenPLC_v3 contains a heap-based buffer overflow in the getData() function in webserver/core/modbus_master.cpp.CVE-2026-11826 · Other software · openplcproject · reported by VulnCheckHigh 8.7
OpenPLC_v3 contains a heap-based buffer overflow in the getData() function in webserver/core/modbus_master.cpp. getData() reads characters between two delimiters into a caller-supplied buffer with no size parameter and no bounds check. In parseConfig() the function is invoked with the 100-byte heap-allocated MB_device.dev_name field. An authenticated attacker with access to the OpenPLC web interface can send a crafted HTTP POST to the /modbus endpoint with an oversized device_name value; the value is persisted to mbconfig.cfg and parsed on load, overflowing dev_name and overwriting adjacent struct fields (protocol at offset 108, dev_address at offset 109, ip_port at offset 210). A 200-byte payload writes 100 bytes past the allocation. The result is heap corruption leading to runtime crash and denial of service of the PLC process control loop, with attacker-controlled overwrite of adjacent configuration fields. The upstream repository was archived on 2026-04-04 and no fix is expected; the vendor has confirmed the issue does not affect OpenPLC Runtime v4.
- Product
- OpenPLC_v3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgist.github.comgithub.com
May 13, 2026A path injection vulnerability exists in OpenPLC v3 (2c82b0e79c53f8c1f1458eee15fec173400d6e1a) as the binary program compiled from glue_generator.cpp does not pCVE-2026-31156 · Other software · Openplcproject · reported by MITREMedium 6.5
A path injection vulnerability exists in OpenPLC v3 (2c82b0e79c53f8c1f1458eee15fec173400d6e1a) as the binary program compiled from glue_generator.cpp does not perform any validation on the file path parameters passed via the command line. The user-controlled input parameters are directly passed to the underlying file operation functions (fopen/ifstream/ofstream) for file reading and writing. An attacker can exploit this vulnerability by constructing a malicious path to read arbitrary readable files.
- Product
- Openplc V3 Firmware
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 9, 2026OpenPLC_V3 REST API endpoint checks for JWT presence but never verifies the caller's role.CVE-2026-35063 · Other software · OpenPLC_V3 · reported by ics-cert@hq.dhs.govHigh 8.7
OpenPLC_V3 REST API endpoint checks for JWT presence but never verifies the caller's role. Any authenticated user with role=user can delete any other user, including administrators, by specifying their user ID or they can create new accounts with role=admin, escalating to full administrator access.
- Product
- OpenPLC_V3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 9, 2026OpenPLC_V3 is vulnerable to a Plaintext Storage of a Password vulnerability that could allow an attacker to retrieve credentials and access sensitive informatioCVE-2026-35556 · Other software · OpenPLC_V3 · reported by ics-cert@hq.dhs.govCritical 9.2
OpenPLC_V3 is vulnerable to a Plaintext Storage of a Password vulnerability that could allow an attacker to retrieve credentials and access sensitive information.
- Product
- OpenPLC_V3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Apr 9, 2026OpenPLC_V3 is vulnerable to an Initialization of a Resource with an Insecure Default vulnerability which could allow an attacker to gain access to the system byCVE-2026-28205 · Other software · OpenPLC_V3 · reported by ics-cert@hq.dhs.govCritical 9.2
OpenPLC_V3 is vulnerable to an Initialization of a Resource with an Insecure Default vulnerability which could allow an attacker to gain access to the system by bypassing authentication via an API.
- Product
- OpenPLC_V3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jan 21, 2026OpenPLC v3 contains an authenticated remote code execution vulnerability that allows attackers with valid credentials to inject malicious code through the hardwCVE-2021-47770 · Other software · Autonomy · reported by VulnCheckHigh 8.6
OpenPLC v3 contains an authenticated remote code execution vulnerability that allows attackers with valid credentials to inject malicious code through the hardware configuration interface. Attackers can upload a custom hardware layer with embedded reverse shell code that establishes a network connection to a specified IP and port, enabling remote command execution.
- Product
- OpenPLC
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comexploit-db.com
Dec 12, 2025OpenPLC_V3 is vulnerable to a cross-site request forgery (CSRF) attack due to the absence of proper CSRF validation.CVE-2025-13970 · Other software · OpenPLC_V3 · reported by ics-cert@hq.dhs.govHigh 7
OpenPLC_V3 is vulnerable to a cross-site request forgery (CSRF) attack due to the absence of proper CSRF validation. This issue allows an unauthenticated attacker to trick a logged-in administrator into visiting a maliciously crafted link, potentially enabling unauthorized modification of PLC settings or the upload of malicious programs which could lead to significant disruption or damage to connected systems.
- Product
- OpenPLC_V3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 7, 2025A denial of service vulnerability exists in the ModbusTCP server functionality of OpenPLC _v3 a931181e8b81e36fadf7b74d5cba99b73c3f6d58.CVE-2025-53476 · Other software · OpenPLC · reported by talos-cna@cisco.comMedium 5.3
A denial of service vulnerability exists in the ModbusTCP server functionality of OpenPLC _v3 a931181e8b81e36fadf7b74d5cba99b73c3f6d58. A specially crafted series of network connections can lead to the server not processing subsequent Modbus requests. An attacker can open a series of TCP connections to trigger this vulnerability.
- Product
- OpenPLC_v3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordtalosintelligence.comtalosintelligence.com
Oct 1, 2025OpenPLC_V3 has a vulnerability in the enipThread function that occurs due to the lack of a return value.CVE-2025-54811 · Other software · OpenPLC_V3 · reported by ics-cert@hq.dhs.govMedium 6.1
OpenPLC_V3 has a vulnerability in the enipThread function that occurs due to the lack of a return value. This leads to a crash when the server loop ends and execution hits an illegal ud2 instruction. This issue can be triggered remotely without authentication by starting the same server multiple times or if the server exits unexpectedly. The vulnerability allows an attacker to cause a Denial of Service (DoS) against the PLC runtime, stopping any PC started remotely without authentication. This results in the PLC process crashing and halting all automation or control logic managed by OpenPLC.
- Product
- OpenPLC_V3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Aug 3, 2025/edit-user in webserver in OpenPLC Runtime 3 through 9cd8f1b allows authenticated users to upload arbitrary files (such as .html or .svg), and these are then puCVE-2025-54962 · Other software · thiagoralves · reported by MITREMedium 6.4
/edit-user in webserver in OpenPLC Runtime 3 through 9cd8f1b allows authenticated users to upload arbitrary files (such as .html or .svg), and these are then publicly accessible under the /static URI.
- Product
- OpenPLC_v3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Feb 5, 2025OpenPLC_V3 contains an arbitrary file upload vulnerability, which could be leveraged for malvertising or phishing campaigns.CVE-2025-1066 · Other software · openPLC · reported by cret@cert.orgCritical 9.8
OpenPLC_V3 contains an arbitrary file upload vulnerability, which could be leveraged for malvertising or phishing campaigns.
- Product
- OpenPLC
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Sep 18, 2024Multiple invalid pointer dereference vulnerabilities exist in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC_v3 16bf8bac1a36d95b73e7b8722d0edb8CVE-2024-39590 · Other software · OpenPLC · reported by talos-cna@cisco.comHigh 7.5
Multiple invalid pointer dereference vulnerabilities exist in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC_v3 16bf8bac1a36d95b73e7b8722d0edb8b9c5bb56a. A specially crafted EtherNet/IP request can lead to denial of service. An attacker can send a series of EtherNet/IP requests to trigger these vulnerabilities.This instance of the vulnerability occurs within the `Protected_Logical_Write_Reply` function
- Product
- OpenPLC_v3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordtalosintelligence.comtalosintelligence.com
Sep 18, 2024Multiple invalid pointer dereference vulnerabilities exist in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC_v3 16bf8bac1a36d95b73e7b8722d0edb8CVE-2024-39589 · Other software · OpenPLC · reported by talos-cna@cisco.comHigh 7.5
Multiple invalid pointer dereference vulnerabilities exist in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC_v3 16bf8bac1a36d95b73e7b8722d0edb8b9c5bb56a. A specially crafted EtherNet/IP request can lead to denial of service. An attacker can send a series of EtherNet/IP requests to trigger these vulnerabilities.This instance of the vulnerability occurs within the `Protected_Logical_Read_Reply` function
- Product
- OpenPLC_v3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordtalosintelligence.comtalosintelligence.com
Sep 18, 2024An out-of-bounds read vulnerability exists in the OpenPLC Runtime EtherNet/IP PCCC parser functionality of OpenPLC_v3 b4702061dc14d1024856f71b4543298d77007b88.CVE-2024-36981 · Other software · OpenPLC · reported by talos-cna@cisco.comHigh 7.5
An out-of-bounds read vulnerability exists in the OpenPLC Runtime EtherNet/IP PCCC parser functionality of OpenPLC_v3 b4702061dc14d1024856f71b4543298d77007b88. A specially crafted network request can lead to denial of service. An attacker can send a series of EtherNet/IP requests to trigger this vulnerability.This is the final instance of the incorrect comparison.
- Product
- OpenPLC_v3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordtalosintelligence.comtalosintelligence.com
Sep 18, 2024An out-of-bounds read vulnerability exists in the OpenPLC Runtime EtherNet/IP PCCC parser functionality of OpenPLC_v3 b4702061dc14d1024856f71b4543298d77007b88.CVE-2024-36980 · Other software · OpenPLC · reported by talos-cna@cisco.comHigh 7.5
An out-of-bounds read vulnerability exists in the OpenPLC Runtime EtherNet/IP PCCC parser functionality of OpenPLC_v3 b4702061dc14d1024856f71b4543298d77007b88. A specially crafted network request can lead to denial of service. An attacker can send a series of EtherNet/IP requests to trigger this vulnerability.This is the first instance of the incorrect comparison.
- Product
- OpenPLC_v3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordtalosintelligence.comtalosintelligence.com
Sep 18, 2024A stack-based buffer overflow vulnerability exists in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC _v3 b4702061dc14d1024856f71b4543298d77007bCVE-2024-34026 · Other software · OpenPLC · reported by talos-cna@cisco.comCritical 9
A stack-based buffer overflow vulnerability exists in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC _v3 b4702061dc14d1024856f71b4543298d77007b88. A specially crafted EtherNet/IP request can lead to remote code execution. An attacker can send a series of EtherNet/IP requests to trigger this vulnerability.
- Product
- OpenPLC_v3
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordtalosintelligence.comtalosintelligence.com
Jun 28, 2024OpenPLC 3 through 9cd8f1b allows XSS via an SVG document as a profile picture.CVE-2024-37741 · Other software · openplcproject · reported by MITREMedium 5.4
OpenPLC 3 through 9cd8f1b allows XSS via an SVG document as a profile picture.
- Product
- openplc_v3_firmware
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record1d8.github.iogithub.com
Aug 3, 2021Command Injection in Open PLC Webserver v3 allows remote attackers to execute arbitrary code via the "Hardware Layer Code Box" component on the "/hardware" pageCVE-2021-31630 · Other software · Openplcproject · reported by MITREHigh 8.8
Command Injection in Open PLC Webserver v3 allows remote attackers to execute arbitrary code via the "Hardware Layer Code Box" component on the "/hardware" page of the application.
- Product
- Openplc V3 Firmware
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordpacketstormsecurity.comyoutube.com
Apr 22, 2019A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions.CVE-2018-20818 · Other software · Openplcproject · reported by MITRECritical 9.8
A buffer overflow vulnerability was discovered in the OpenPLC controller, in the OpenPLC_v2 and OpenPLC_v3 versions. It occurs in the modbus.cpp mapUnusedIO() function, which can cause a runtime crash of the PLC or possibly have unspecified other impact.
- Product
- Openplc V2 Firmware
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
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.
Weekly security brief
The flaws that hit local websites, every Friday.
One short email: what got exploited this week, which WordPress plugins broke, and what to check. Unsubscribe in one click.
Tell us what you're building.
A website, your marketing, a security check, an app, or the thing you've been running out of a spreadsheet for three years. A few lines is plenty.
Not ready to talk yet? Run the free website check and see what Google sees.