PT-2026-48938 · Mattermost · Mattermost

Neganspl01T · Published 2026-06-12 · Updated 2026-06-12 · CVE-2026-6739

Mitre

CVSS v3.1

6.7

Medium

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L

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

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-6739

Affected Products

Mattermost

References · 2

• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6739 · Security Note