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Known Affected Software Configurations Switch to CPE 2.2

Change History

OR
          *cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* versions from (including) 10.11.0 up to (excluding) 10.11.11
          *cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* versions from (including) 11.2.0 up to (excluding) 11.2.3
          *cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* versions from (including) 11.3.0 up to (excluding) 11.3.1

Mattermost, Inc.: https://mattermost.com/security-updates Types: Vendor Advisory

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to validate team-specific upload_file permissions which allows a guest user to post files in channels where they lack upload_file permission via uploading files in a team where they have permission and reusing the file metadata in a POST request to a different team. Mattermost Advisory ID: MMSA-2025-00553

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CWE-863

https://mattermost.com/security-updates