CVE-2025-27571 Information

Description

Mattermost versions 10.5.x <= 10.5.1 10.4.x <= 10.4.3 9.11.x <= 9.11.9 fail to check the \Allow Users to View Archived Channels\ configuration when fetching channel metadata of a post from archived channels which allows authenticated users to access such information when a channel is archived.

Reference

https://mattermost.com/security-updates