2025-07-18 08:48:02
Mattermost
PUBLISHED
Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they dont have access to via guessing the PendingPostID of recently created posts.