CVE-2026-6343
Mattermost doesn't check public/private permissions
4.3
MEDIUM
CVSS 3.1
EPSS 0.02%
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591
How to fix CVE-2026-6343
To remediate CVE-2026-6343, upgrade the affected package to a fixed version below.
- —upgrade to 1.41.1-0.20260309184833-887d9cacb616 or later
- —upgrade to 11.5.2 or later
Is CVE-2026-6343 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.41.1-0.20260309184833-887d9cacb616
- >= 11.5.0, < 11.5.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |