CVE-2025-3611: Mattermost fails to properly enforce access control restrictions for System Manager roles

May 30, 2025

Mattermost versions 10.7.x <= 10.7.0, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fails to properly enforce access control restrictions for System Manager roles, allowing authenticated users with System Manager privileges to view team details they should not have access to via direct API requests to team endpoints, even when explicitly configured with ‘No access’ to Teams in the System Console.

References

github.com/advisories/GHSA-86jg-35xj-3vv5
github.com/mattermost/mattermost
github.com/mattermost/mattermost/commit/6f33b721de76b39a7714bfe0d5e9c1306869a3e3
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-3611

Code Behaviors & Features

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