High severity8.7NVD Advisory· Published May 18, 2026· Updated May 18, 2026
CVE-2026-6346
CVE-2026-6346
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields before including them in support packet generation, which allows a Mattermost System Admin or any party with access to a support packet to obtain sensitive credentials in plaintext via downloading a support packet from the System Console.. Mattermost Advisory ID: MMSA-2026-00607
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 | >= 11.5.0, < 11.5.2 | 11.5.2 |
github.com/mattermost/mattermost/server/v8Go | >= 10.11.0, < 10.11.14 | 10.11.14 |
github.com/mattermost/mattermost/server/v8Go | >= 11.4.0, < 11.4.4 | 11.4.4 |
github.com/mattermost/mattermost/server/v8Go | < 8.0.0-20260326202606-fac92f4a71f3 | 8.0.0-20260326202606-fac92f4a71f3 |
github.com/mattermost/mattermost-serverGo | < 5.3.2-0.20260326202606-fac92f4a71f3 | 5.3.2-0.20260326202606-fac92f4a71f3 |
Affected products
3- Range: <=10.11.13, <=11.4.3, <=11.5.1
- ghsa-coords2 versionspkg:golang/github.com/mattermost/mattermost-serverpkg:golang/github.com/mattermost/mattermost/server/v8
< 5.3.2-0.20260326202606-fac92f4a71f3+ 1 more
- (no CPE)range: < 5.3.2-0.20260326202606-fac92f4a71f3
- (no CPE)range: >= 11.5.0, < 11.5.2
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-9p64-jpc7-m2rpghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-6346ghsaADVISORY
- github.com/mattermost/mattermost/commit/fac92f4a71f356009e27983a980f729f599e8ba5ghsaWEB
News mentions
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