CVE-2026-6739
HIGH WAF: Low
CVSS 7.2
Published: 2026-06-12
CWE-863
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
WAF Coverage Analysis
Incorrect Authorization
Low WAF Coverage
OWASP: A01:2021 Broken Access Control
Affected Software
| Vendor | Product | Version |
|---|---|---|
| mattermost | mattermost_server | 10.11.0 - 10.11.17 |
| mattermost | mattermost_server | 11.5.0 - 11.5.5 |
| mattermost | mattermost_server | 11.6.0 - 11.6.2 |
References
- mattermost.com (Vendor Advisory)