CVE-2026-6739

Published Jun 12, 2026

Last updated a day ago

CVSS medium 6.7

Overview

Description
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
Source
responsibledisclosure@mattermost.com
NVD status
Received

Risk scores

CVSS 3.1

Type
Secondary
Base score
6.7
Impact score
5.5
Exploitability score
1.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L
Severity
MEDIUM

Weaknesses

responsibledisclosure@mattermost.com
CWE-863

Social media

Hype score
Not currently trending

References

Sources include official advisories and independent security research.