Missing Authorization

Overview github.com/mattermost/mattermost/server/channels/app is a private-cloud Slack alternative Affected versions of this package are vulnerable to Missing Authorization in the invite ID validation process. An attacker can gain unauthorized access to create accounts by using leaked invite IDs...

GHSA-FX49-M253-27JJ Mattermost fails to filter invite IDs based on user permissions

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to filter invite IDs based on user permissions, which allows regular users to bypass access control restrictions and register unauthorized accounts via leaked invite IDs during team creation. Mattermost Advisory ID:...

PT-2026-25679

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.0 through 10.11.10 Mattermost versions 11.2.0 through 11.2.2 Mattermost versions 11.3.0 Description Mattermost does not properly filter invite IDs based on user permissions. This allows regular users to bypass access...