Medium severity6.5NVD Advisory· Published Sep 15, 2025· Updated Jun 17, 2026
CVE-2025-9076
CVE-2025-9076
Description
Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled.
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/server/v8Go | < 8.0.0-20250729073403-517ae758cd02 | 8.0.0-20250729073403-517ae758cd02 |
github.com/mattermost/mattermost-serverGo | >= 10.10.0, < 10.10.2 | 10.10.2 |
Affected products
8cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=10.10.0,<10.10.2
- (no CPE)range: 10.10.0
- ghsa-coords6 versionspkg:golang/github.com/mattermost/mattermost-serverpkg:golang/github.com/mattermost/mattermost/server/v8pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Tumbleweedpkg:rpm/suse/govulncheck-vulndb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP6
>= 10.10.0, < 10.10.2+ 5 more
- (no CPE)range: >= 10.10.0, < 10.10.2
- (no CPE)range: < 8.0.0-20250729073403-517ae758cd02
- (no CPE)range: < 0.0.20250918T182144-150000.1.107.1
- (no CPE)range: < 0.0.20260723T184607-160000.1.1
- (no CPE)range: < 0.0.20250917T170349-1.1
- (no CPE)range: < 0.0.20250918T182144-150000.1.107.1
Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-3vcm-c42p-3hhfghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2025-9076ghsaADVISORY
News mentions
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