Description
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.
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
10.11.0 to ≤ 10.11.3affected10.5.0 to ≤ 10.5.11affected10.12.0 to ≤ 10.12.0affected11.0.0unaffected10.11.4unaffected10.5.12unaffected10.12.1unaffected