CVE-2025-9081

CVE-2025-9081 is a low-severity security vulnerability in github.com/mattermost/mattermost-plugin-boards (go), affecting versions < 0.0.0-20250716054606-3f3e3becfe1d. It is fixed in 0.0.0-20250716054606-3f3e3becfe1d, 8.0.0-20250721095935-11c36f4d1e44, 10.5.9, 9.11.18.

Summary

Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate access controls which allows any authenticated user to download sensitive files via board file download endpoint using UUID enumeration

Impact

CVE-2025-9081 has a CVSS score of 3.1 (Low). The vector is network-reachable, low privileges required, and no user interaction. 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 (0.0.0-20250716054606-3f3e3becfe1d, 8.0.0-20250721095935-11c36f4d1e44, 10.5.9, 9.11.18); upgrading removes the vulnerable code path.

Affected versions

github.com/mattermost/mattermost-plugin-boards (< 0.0.0-20250716054606-3f3e3becfe1d) github.com/mattermost/mattermost/server/v8 (< 8.0.0-20250721095935-11c36f4d1e44) github.com/mattermost/mattermost-server (>= 10.5.0-rc1, < 10.5.9) github.com/mattermost/mattermost-server (>= 9.11.0-rc1, < 9.11.18)

Security releases

github.com/mattermost/mattermost-plugin-boards → 0.0.0-20250716054606-3f3e3becfe1d (go) github.com/mattermost/mattermost/server/v8 → 8.0.0-20250721095935-11c36f4d1e44 (go) github.com/mattermost/mattermost-server → 10.5.9 (go) github.com/mattermost/mattermost-server → 9.11.18 (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-plugin-boards to 0.0.0-20250716054606-3f3e3becfe1d or later; github.com/mattermost/mattermost/server/v8 to 8.0.0-20250721095935-11c36f4d1e44 or later; github.com/mattermost/mattermost-server to 10.5.9 or later; github.com/mattermost/mattermost-server to 9.11.18 or later

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

Frequently Asked Questions

  1. What is CVE-2025-9081? CVE-2025-9081 is a low-severity security vulnerability in github.com/mattermost/mattermost-plugin-boards (go), affecting versions < 0.0.0-20250716054606-3f3e3becfe1d. It is fixed in 0.0.0-20250716054606-3f3e3becfe1d, 8.0.0-20250721095935-11c36f4d1e44, 10.5.9, 9.11.18.
  2. How severe is CVE-2025-9081? CVE-2025-9081 has a CVSS score of 3.1 (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-2025-9081?
    • github.com/mattermost/mattermost-plugin-boards (go) (versions < 0.0.0-20250716054606-3f3e3becfe1d)
    • github.com/mattermost/mattermost/server/v8 (go) (versions < 8.0.0-20250721095935-11c36f4d1e44)
    • github.com/mattermost/mattermost-server (go) (versions >= 10.5.0-rc1, < 10.5.9)
  4. Is there a fix for CVE-2025-9081? Yes. CVE-2025-9081 is fixed in 0.0.0-20250716054606-3f3e3becfe1d, 8.0.0-20250721095935-11c36f4d1e44, 10.5.9, 9.11.18. Upgrade to this version or later.
  5. Is CVE-2025-9081 exploitable, and should I be worried? Whether CVE-2025-9081 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-2025-9081 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-2025-9081?
    • Upgrade github.com/mattermost/mattermost-plugin-boards to 0.0.0-20250716054606-3f3e3becfe1d or later
    • Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20250721095935-11c36f4d1e44 or later
    • Upgrade github.com/mattermost/mattermost-server to 10.5.9 or later
    • Upgrade github.com/mattermost/mattermost-server to 9.11.18 or later

Other vulnerabilities in github.com/mattermost/mattermost-plugin-boards

CVE-IDSeverityPackage summary
CVE-2026-2461Mediumgithub.com/mattermost/mattermost-plugin-boards: Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications

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