Mattermost Server 9.11.x < 9.11.10 / 10.4.x < 10.4.4 / 10.5.x < 10.5.2 / 10.6.0 (MMSA-2025-00452)

The version of Mattermost Server installed on the remote host is prior to 9.11.10, 10.4.4, or 10.5.2 / 10.6.0. It is, therefore, affected by a vulnerability as referenced in the MMSA-2025-00452 advisory. - Mattermost versions 10.5.x = 10.5.1, 10.4.x = 10.4.3, 9.11.x = 9.11.9 fail to check the All...

Mattermost Incorrect Authorization vulnerability

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...

CVE-2025-27571 Channel metadata visible in archived channels despite configuration setting

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...

CVE-2025-27571 Channel metadata visible in archived channels despite configuration setting

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...