Description
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to archive the channel before removing persistent notifications which allows authenticated user to crash the server via timing the creation of persistent notification message between the server deleting existing persistent notifications and archiving the channel.. Mattermost Advisory ID: MMSA-2026-00637
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mattermost Mattermost
Default version status: unaffected
11.6.0 to ≤ 11.6.0affected11.5.0 to ≤ 11.5.3affected11.4.0 to ≤ 11.4.4affected10.11.0 to ≤ 10.11.14affected11.7.0unaffected11.6.1unaffected11.5.4unaffected11.4.5unaffected10.11.15unaffected