Description
Mattermost versions 9.11.x <= 9.11.0, 9.10.x <= 9.10.1, 9.9.x <= 9.9.2 and 9.5.x <= 9.5.8 fail to properly authorize requests when viewing archived channels is disabled, which allows an attacker to retrieve post and file information about archived channels. Examples are flagged or unread posts as well as files.
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
9.11.0affected9.10.0 to ≤ 9.10.1affected9.9.0 to ≤ 9.9.2affected9.5.0 to ≤ 9.5.8affected10.0.0unaffected9.11.1unaffected9.10.2unaffected9.9.3unaffected9.5.9unaffected