Mattermost: Delegated admins could patch protected default system roles
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
Problem Types
| Type | CWE ID | Description |
|---|
| CWE | CWE-863 | CWE-863: Incorrect Authorization |
Type: CWE
Description: CWE-863: Incorrect Authorization
Metrics
| Version | Base score | Base severity | Vector |
|---|
| 3.1 | 6.7 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L |
Version: 3.1
Base score: 6.7
Base severity: MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L