Low severityNVD Advisory· Published Nov 13, 2025· Updated Nov 13, 2025
Cross-team channel membership access
CVE-2025-11777
Description
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
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost-serverGo | >= 10.11.0, < 10.11.4 | 10.11.4 |
github.com/mattermost/mattermost-serverGo | >= 10.5.0, < 10.5.12 | 10.5.12 |
github.com/mattermost/mattermost/server/v8Go | < 8.0.0-20250905150616-ba86dfc5876b | 8.0.0-20250905150616-ba86dfc5876b |
github.com/mattermost/mattermostGo | < 5.3.2-0.20250905150616-ba86dfc5876b | 5.3.2-0.20250905150616-ba86dfc5876b |
github.com/mattermost/mattermost-serverGo | < 5.3.2-0.20250905150616-ba86dfc5876b | 5.3.2-0.20250905150616-ba86dfc5876b |
github.com/mattermost/mattermost-server/v5Go | < 5.3.2-0.20250905150616-ba86dfc5876b | 5.3.2-0.20250905150616-ba86dfc5876b |
github.com/mattermost/mattermost-server/v6Go | < 5.3.2-0.20250905150616-ba86dfc5876b | 5.3.2-0.20250905150616-ba86dfc5876b |
Affected products
7- ghsa-coords6 versionspkg:golang/github.com/mattermost/mattermostpkg:golang/github.com/mattermost/mattermost-serverpkg:golang/github.com/mattermost/mattermost-server/v5pkg:golang/github.com/mattermost/mattermost-server/v6pkg:golang/github.com/mattermost/mattermost/server/v8pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6
< 5.3.2-0.20250905150616-ba86dfc5876b+ 5 more
- (no CPE)range: < 5.3.2-0.20250905150616-ba86dfc5876b
- (no CPE)range: >= 10.11.0, < 10.11.4
- (no CPE)range: < 5.3.2-0.20250905150616-ba86dfc5876b
- (no CPE)range: < 5.3.2-0.20250905150616-ba86dfc5876b
- (no CPE)range: < 8.0.0-20250905150616-ba86dfc5876b
- (no CPE)range: < 0.0.20251230T014957-150000.1.134.1
- Range: 10.11.0
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-mqcj-8c2g-h97qghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-11777ghsaADVISORY
- github.com/mattermost/mattermost/commit/98acefe911dd9de7edf47a7d825dd99f53141a52ghsaWEB
- github.com/mattermost/mattermost/commit/ba86dfc5876b354b9d3c20ff45c08ca6f8426149ghsaWEB
- github.com/mattermost/mattermost/commit/d72d437f1567ba0b639b6e4fd73bab06c51baab5ghsaWEB
- mattermost.com/security-updatesghsaWEB
News mentions
0No linked articles in our index yet.