Headline
GHSA-424h-xj87-m937: Mattermost has an Incorrect Authorization vulnerability
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the /api/v4/channels/{channel_id}/members endpoint
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- GitHub Advisory Database
- GitHub Reviewed
- CVE-2025-10545
Mattermost has an Incorrect Authorization vulnerability
Low severity GitHub Reviewed Published Oct 16, 2025 to the GitHub Advisory Database • Updated Oct 16, 2025
Package
gomod github.com/mattermost/mattermost-server (Go)
Affected versions
>= 10.5.0, < 10.5.11
>= 10.11.0, < 10.11.3
Patched versions
10.5.11
10.11.3
gomod github.com/mattermost/mattermost/server/v8 (Go)
< 8.0.0-20250820115038-ff30b84049f0
8.0.0-20250820115038-ff30b84049f0
Description
Published to the GitHub Advisory Database
Oct 16, 2025
Last updated
Oct 16, 2025
EPSS score