Description
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel autocomplete handler, which allows an authenticated user without that permission to enumerate configured remote cluster connection metadata via slash command autocomplete.. Mattermost Advisory ID: MMSA-2026-00676
Problem types
CWE-862: Missing Authorization
Product status
11.7.0 (semver)
11.6.0 (semver)
10.11.0 (semver)
11.8.0
11.7.3
11.6.5
10.11.20
Credits
adamsec-dev
References
mattermost.com/security-updates (MMSA-2026-00676)