Description
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint
Problem types
CWE-863: Incorrect Authorization
Product status
10.5.0
10.11.0
10.12.0
10.5.11
10.11.3
Credits
lordwillmore
References
mattermost.com/security-updates