Headline
GHSA-58w6-w55x-6wq8: Mattermost fails to validate user permissions in Boards
Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to
- GitHub Advisory Database
- GitHub Reviewed
- CVE-2025-13870
Mattermost fails to validate user permissions in Boards
Low severity GitHub Reviewed Published Dec 2, 2025 to the GitHub Advisory Database • Updated Dec 3, 2025
Package
gomod github.com/mattermost/mattermost (Go)
Affected versions
>= 10.11.0, < 10.11.5
>= 10.5.0, < 10.5.13
Patched versions
10.11.5
10.5.13
gomod github.com/mattermost/mattermost/server/v8 (Go)
< 8.0.0-20250905150616-ba86dfc5876b
8.0.0-20250905150616-ba86dfc5876b
Published to the GitHub Advisory Database
Dec 2, 2025