GitHub Advisoryadvisory · Packagist

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

MEDIUM Published 2026-05-11 Modified 2026-06-05 Official page ↗
Aliases
CVE-2026-34579
Ecosystem
Packagist
Packages
mantisbt/mantisbt
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weaknesses
CWE-200, CWE-201
Reviewed
2026-05-11

Affected packages

• Packagist mantisbt/mantisbt: >= 2.26.1, < 2.28.2 → fixed in 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.

Related

Alias · CVE (1)

  • CVE-2026-34579 Mantis Bug Tracker (MantisBT) is an open source issue tracker. vulnerability

Weakness · CWE (2)

  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor weakness
  • CWE-201 Insertion of Sensitive Information Into Sent Data weakness

References