Guest user can discover active public channels in github.com/mattermost/mattermost-server
Guest user can discover active public channels in github.com/mattermost/mattermost-server
02 / AFFECTED SOFTWARE
Affected packages
39 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
Mattermost versions 10.5.x <= 10.5.12, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` endpoint
Guest user can discover active public channels in github.com/mattermost/mattermost-server
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` endpoint
05 / REFERENCES
Further evidence
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/41xxx/CVE-2025-41443.json
- https://mattermost.com/security-updates
- https://nvd.nist.gov/vuln/detail/CVE-2025-41443
- https://github.com/mattermost/mattermost
- https://github.com/mattermost/mattermost/commit/e8c7e7d0252bbf1e098aae4a5ea05d945afd7e70
- https://github.com/mattermost/mattermost/pull/31327
- https://github.com/mattermost/mattermost/pull/33778