CVE-2026-16049

The Mattermost GitLab plugin (versions ≤11.8, 10.20.11, 11.5.7.0) fails to verify channel permissions for caller-supplied post_id and does not validate the web_url parameter against the configured GitLab instance. Through the createIssue and attachCommentToIssue API endpoints, an authenticated at...

CVE-2026-16049

Mattermost Plugins versions =11.8 10.20.11 11.5.7.0 The Mattermost GitLab plugin fails to verify channel permissions when processing API requests with a caller-supplied postid, and fails to validate the weburl parameter against the configured GitLab instance, which allows an authenticated attacke...