CVE-2025-10545GHSA-424H-XJ87-M937GO-2025-4030
Guest user can add unauthorized team users to private channels
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 8.0.0-20250820115038-ff30b84049f0, 10.5.11, 10.11.3, 10.5.11+incompatible, 10.11.3+incompatible
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Mattermost Mattermost
From 10.5.0 · through 10.5.10; From 10.11.0 · through 10.11.2
- github.com/mattermost/mattermost/server/v8Go
fixed in 8.0.0-20250820115038-ff30b84049f0
- github.com/mattermost/mattermost-serverGo
From 10.5.0 · fixed in 10.5.11
- github.com/mattermost/mattermost-serverGo
From 10.11.0 · fixed in 10.11.3
- github.com/mattermost/mattermost-serverGo
From 10.5.0+incompatible · fixed in 10.5.11+incompatible; From 10.11.0+incompatible · fixed in 10.11.3+incompatible
- github.com/mattermost/mattermost-server/v5Go
All versions
- github.com/mattermost/mattermost-server/v6Go
All versions