CVE-2026-6739
Medium · 6.7CVSS
6.7
EPSS
0.5%
Published
Jun 12, 2026
CISA due date
—
The record
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to require system-level permission when patching protected default system roles, which allows authenticated users with delegated user-management permissions to escalate privileges by altering built-in role permissions via the role patch API.. Mattermost Advisory ID: MMSA-2026-00656
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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