Mattermost has an Incorrect Authorization vulnerability in github.com/mattermost/mattermost-server
Mattermost has an Incorrect Authorization vulnerability 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 <= 10.5.10, 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
Mattermost has an Incorrect Authorization vulnerability 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 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
05 / REFERENCES
Further evidence
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/10xxx/CVE-2025-10545.json
- https://mattermost.com/security-updates
- https://nvd.nist.gov/vuln/detail/CVE-2025-10545
- https://github.com/advisories/GHSA-424h-xj87-m937
- https://github.com/mattermost/mattermost/commit/fb9c583f5e466a566a5122154ef337bbf2238902
- https://github.com/mattermost/mattermost/commit/ff30b84049f0193f0570d30e46cffc3602298c67
- https://github.com/mattermost/mattermost/pull/31319
- https://github.com/mattermost/mattermost/pull/33827
- https://github.com/mattermost/mattermost