Description
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler, which allows any authenticated user to overwrite the global default GitLab instance configuration via the {{/gitlab connect }} slash command.. Mattermost Advisory ID: MMSA-2026-00644
Severity (CVSS)
| Base score | 5.4 |
|---|---|
| Severity | Medium |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
| Provided by | CNA |
Weaknesses
- CWE-862 — CWE-862: Missing Authorization
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 11.7.0 to <=11.7.0; 11.6.0 to <=11.6.2; 11.5.0 to <=11.5.5; 10.11.0 to <=10.11.17; 11.8.0; 11.7.1; 11.6.3; 11.5.6; 10.11.18 |
References
- https://mattermost.com/security-updates (vendor-advisory)
Generated from the official CVE List on 22 Jun 2026 14:43 UTC.