CVE-2026-9824

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.7.0 through 11.7.2 Mattermost versions 11.6.0 through 11.6.4 Mattermost versions 10.11.0 through 10.11.19

Description An issue exists where the /share-channel autocomplete handler fails to verify the manage shared channels permission. This allows an authenticated user who lacks this permission to enumerate metadata related to configured remote cluster connections using slash command autocomplete.

Recommendations Update Mattermost versions 11.7.0 through 11.7.2 to a version newer than 11.7.2. Update Mattermost versions 11.6.0 through 11.6.4 to a version newer than 11.6.4. Update Mattermost versions 10.11.0 through 10.11.19 to a version newer than 10.11.19.