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EUVD-2026-319718

fkie_cve-2026-34579

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior are vulnerable to Authorization Bypass through the private issue monitoring feature . Using a crafted POST request to bug_monitor_add.php, a user with project-level access can add themselves as a monitor for a private issue they do not have access to. Despite displaying an Access Denied error, the application accepts the request and creates a monitor relationship for the private issue. Direct access to the private issue remains blocked, but the user will receive email notifications for updates, leading to disclosure of the private issue's metadata and content. This issue has been fixed in version 2.28.2.

GHSA-ggw7-9675-6v4v — MantisBT has an authorization bypass in private issue monitoring

Affected: Packagist: mantisbt/mantisbt

Using a crafted POST request to bug_monitor_add.php, a user with project-level access can add themselves as a monitor for a private issue they do not have access to. Despite displaying an Access Denied error, the application accepts the request and creates a monitor relationship for the private issue.

### Impact Direct access to the private issue remains blocked, but the user will receive email notifications for updates, leading to disclosure of the private issue's metadata and content.

### Patches - 0a93267deba445fb9d15250c16e6fdb1246ffa65

### Workarounds None

### Credits Thanks to Vishal Shukla for discovering and responsibly reporting the issue.