Security Advisory
CVE-2025-11777
3.1
LOW
Vulnerability Description
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint
Published Date
November 13, 2025
Official Source
NIST NVD Advisory