Missing authorization check allows unauthorized modification of other users' comments on a board
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
Severity medium: primary CNA CVSS 4.3 v3.1 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2026-03-16T11:16:32.720Z. Updated 2026-03-16T13:49:57.924Z.