CVE-2026-2461: Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications

March 16, 2026 (updated March 19, 2026)

Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559

References

github.com/advisories/GHSA-hf8w-x9h5-5gf9
github.com/mattermost/mattermost-plugin-boards
github.com/mattermost/mattermost-plugin-boards/commit/57c5be5b6ef59d02dd72e35094d1fae8ba6e9619
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2026-2461

Code Behaviors & Features

Detect and mitigate CVE-2026-2461 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →