Description
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field.. Mattermost Advisory ID: MMSA-2026-00661
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 ≤ 11.6.1affected11.5.0 to ≤ 11.5.4affected10.11.0 to ≤ 10.11.15affected10.11.0 to ≤ 10.11.16affected11.7.0unaffected11.6.2unaffected11.5.5unaffected10.11.16unaffected10.11.17unaffected