CVE-2025-13352

CVE-2025-13352 is a low-severity security vulnerability in github.com/mattermost/mattermost/server/v8 (go), affecting versions >= 10.11.0-rc1, < 10.11.7-0.20251106103514-3b05384dd014. It is fixed in 10.11.7-0.20251106103514-3b05384dd014, 11.1.0, 1.0.1-0.20250829075715-0deffcfc6bee.

Summary

Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions <=2.4.0 fail to validate plugin bot identity in reaction forwarding which allows attackers to hijack the GitHub reaction feature to make users add reactions to arbitrary GitHub objects via crafted notification posts.

Impact

CVE-2025-13352 has a CVSS score of 3.0 (Low). The vector is network-reachable, low privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (10.11.7-0.20251106103514-3b05384dd014, 11.1.0, 1.0.1-0.20250829075715-0deffcfc6bee); upgrading removes the vulnerable code path.

Affected versions

github.com/mattermost/mattermost/server/v8 (>= 10.11.0-rc1, < 10.11.7-0.20251106103514-3b05384dd014) github.com/mattermost/mattermost (< 10.11.7-0.20251106103514-3b05384dd014) github.com/mattermost/mattermost (>= 11.0.0-alpha.1, < 11.1.0) github.com/mattermost/mattermost-plugin-github (< 1.0.1-0.20250829075715-0deffcfc6bee)

Security releases

github.com/mattermost/mattermost/server/v8 → 10.11.7-0.20251106103514-3b05384dd014 (go) github.com/mattermost/mattermost → 10.11.7-0.20251106103514-3b05384dd014 (go) github.com/mattermost/mattermost → 11.1.0 (go) github.com/mattermost/mattermost-plugin-github → 1.0.1-0.20250829075715-0deffcfc6bee (go)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

See it in your environment

Remediation advice

Upgrade the following packages to resolve this vulnerability:

github.com/mattermost/mattermost/server/v8 to 10.11.7-0.20251106103514-3b05384dd014 or later; github.com/mattermost/mattermost to 10.11.7-0.20251106103514-3b05384dd014 or later; github.com/mattermost/mattermost to 11.1.0 or later; github.com/mattermost/mattermost-plugin-github to 1.0.1-0.20250829075715-0deffcfc6bee or later

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

  1. What is CVE-2025-13352? CVE-2025-13352 is a low-severity security vulnerability in github.com/mattermost/mattermost/server/v8 (go), affecting versions >= 10.11.0-rc1, < 10.11.7-0.20251106103514-3b05384dd014. It is fixed in 10.11.7-0.20251106103514-3b05384dd014, 11.1.0, 1.0.1-0.20250829075715-0deffcfc6bee.
  2. How severe is CVE-2025-13352? CVE-2025-13352 has a CVSS score of 3.0 (Low). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
  3. Which packages are affected by CVE-2025-13352?
    • github.com/mattermost/mattermost/server/v8 (go) (versions >= 10.11.0-rc1, < 10.11.7-0.20251106103514-3b05384dd014)
    • github.com/mattermost/mattermost (go) (versions < 10.11.7-0.20251106103514-3b05384dd014)
    • github.com/mattermost/mattermost-plugin-github (go) (versions < 1.0.1-0.20250829075715-0deffcfc6bee)
  4. Is there a fix for CVE-2025-13352? Yes. CVE-2025-13352 is fixed in 10.11.7-0.20251106103514-3b05384dd014, 11.1.0, 1.0.1-0.20250829075715-0deffcfc6bee. Upgrade to this version or later.
  5. Is CVE-2025-13352 exploitable, and should I be worried? Whether CVE-2025-13352 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
  6. What actually determines whether CVE-2025-13352 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
  7. How do I fix CVE-2025-13352?
    • Upgrade github.com/mattermost/mattermost/server/v8 to 10.11.7-0.20251106103514-3b05384dd014 or later
    • Upgrade github.com/mattermost/mattermost to 10.11.7-0.20251106103514-3b05384dd014 or later
    • Upgrade github.com/mattermost/mattermost to 11.1.0 or later
    • Upgrade github.com/mattermost/mattermost-plugin-github to 1.0.1-0.20250829075715-0deffcfc6bee or later

Other vulnerabilities in github.com/mattermost/mattermost/server/v8

CVE-2026-4915CVE-2026-5740CVE-2026-4055CVE-2026-5163CVE-2026-6343

Stop the waste.
Protect your environment with Kodem.

Get a personalized demo
Get a personalized demo