In short
- CVE-2026-34579 is a MEDIUM (CVSS 5.3) vulnerability affecting mantisbt/mantisbt.
- Chance of exploitation in the next 30 days (EPSS): 0.36%, higher than 30.1% of all vulnerabilities.
- Fix: update to 2.28.2 or later.
| Package | Affected versions | Patched versions |
|---|
| mantisbt/mantisbt Packagist | ≥ 2.26.1, < 2.28.2
| 2.28.2
|
Description
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.
NVD description
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.
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