Description
Mattermost versions 9.5.x <= 9.5.3, 9.6.x <= 9.6.1 and 8.1.x <= 8.1.12 fail to perform proper input validation on post actions which allows an attacker to run a playbook checklist task command as another user via creating and sharing a deceptive post action that unexpectedly runs a slash command in some arbitrary channel.
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
9.5.0 to ≤ 9.5.3affected9.6.0 to ≤ 9.6.1affected8.1.0 to ≤ 8.1.12affected9.7.0unaffected9.5.4unaffected9.6.2unaffected8.1.13unaffected