Low severity3.1NVD Advisory· Published Nov 13, 2025· Updated Jun 17, 2026
CVE-2025-11777
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
910.11.0+ 1 more
- (no CPE)range: 10.11.0
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=10.5.0,<10.5.12
- ghsa-coords7 versionspkg:golang/github.com/mattermost/mattermost-serverpkg:golang/github.com/mattermost/mattermost/server/v8pkg:golang/github.com/mattermost/mattermostpkg:golang/github.com/mattermost/mattermost-server/v5pkg:golang/github.com/mattermost/mattermost-server/v6pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0
>= 10.11.0, < 10.11.4+ 6 more
- (no CPE)range: >= 10.11.0, < 10.11.4
- (no CPE)range: < 8.0.0-20250905150616-ba86dfc5876b
- (no CPE)range: < 5.3.2-0.20250905150616-ba86dfc5876b
- (no CPE)range: < 5.3.2-0.20250905150616-ba86dfc5876b
- (no CPE)range: < 5.3.2-0.20250905150616-ba86dfc5876b
- (no CPE)range: < 0.0.20251230T014957-150000.1.134.1
- (no CPE)range: < 0.0.20260723T184607-160000.1.1
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-mqcj-8c2g-h97qghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- 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
News mentions
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