Medium severity6.5NVD Advisory· Published May 18, 2026· Updated May 18, 2026
CVE-2026-6345
CVE-2026-6345
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail prevent disclosure of created user password which allows a malicious attacker to impersonate a user via the use of some of those passwords.. Mattermost Advisory ID: MMSA-2026-00614
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 | < 8.0.0-20260311102650-3057ae7e83e9 | 8.0.0-20260311102650-3057ae7e83e9 |
github.com/mattermost/mattermost-serverGo | < 5.3.2-0.20260311102650-3057ae7e83e9 | 5.3.2-0.20260311102650-3057ae7e83e9 |
Affected products
4cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: >=10.11.0,<10.11.14
- (no CPE)range: 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3
- ghsa-coords2 versionspkg:golang/github.com/mattermost/mattermost-serverpkg:golang/github.com/mattermost/mattermost/server/v8
< 5.3.2-0.20260311102650-3057ae7e83e9+ 1 more
- (no CPE)range: < 5.3.2-0.20260311102650-3057ae7e83e9
- (no CPE)range: >= 11.5.0, < 11.5.2
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-wvgv-4fc3-2rcpghsaADVISORY
- mattermost.com/security-updatesnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-6345ghsaADVISORY
- github.com/mattermost/mattermost/commit/3057ae7e83e9c827ce7818d67c0f3a208f0d9709ghsaWEB
News mentions
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