CVE-2026-6346
Mattermost doesn't sanitize sensitive configuration fields before including them in support packet generation
8.7
HIGH
CVSS 3.1
EPSS 0.04%
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
How to fix CVE-2026-6346
To remediate CVE-2026-6346, upgrade the affected package to a fixed version below.
- —upgrade to 5.3.2-0.20260326202606-fac92f4a71f3 or later
- —upgrade to 11.5.2 or later
Is CVE-2026-6346 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 5.3.2-0.20260326202606-fac92f4a71f3
- >= 11.5.0, < 11.5.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.7 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N |