Cross-team channel membership access
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 10.11.4, 10.5.12, 8.0.0-20250905150616-ba86dfc5876b, 5.3.2-0.20250905150616-ba86dfc5876b, 10.5.12+incompatible, and 2 more
- 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
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Mattermost Mattermost
From 10.11.0 · through 10.11.3; From 10.5.0 · through 10.5.11
- github.com/mattermost/mattermost-serverGo
From 10.11.0 · fixed in 10.11.4
- github.com/mattermost/mattermost-serverGo
From 10.5.0 · fixed in 10.5.12
- github.com/mattermost/mattermost/server/v8Go
fixed in 8.0.0-20250905150616-ba86dfc5876b
- github.com/mattermost/mattermostGo
fixed in 5.3.2-0.20250905150616-ba86dfc5876b
- github.com/mattermost/mattermost-serverGo
fixed in 5.3.2-0.20250905150616-ba86dfc5876b
- github.com/mattermost/mattermost-server/v5Go
fixed in 5.3.2-0.20250905150616-ba86dfc5876b
- github.com/mattermost/mattermost-server/v6Go
fixed in 5.3.2-0.20250905150616-ba86dfc5876b
- github.com/mattermost/mattermostGo
All versions
- github.com/mattermost/mattermost/v5Go
All versions
- github.com/mattermost/mattermost-serverGo
From 10.5.0+incompatible · fixed in 10.5.12+incompatible; From 10.11.0+incompatible · fixed in 10.11.4+incompatible
- github.com/mattermost/mattermost-server/v5Go
All versions
- github.com/mattermost/mattermost-server/v6Go
All versions
- github.com/mattermost/mattermost/server/v8Go
fixed in 8.0.0-20251212204551-54f2e9b4afd5