Insertion of Sensitive Information Into Sent Data in MantisBT - CVE-2026-34579
Published: November 6, 2026
Vulnerability identifier: #VU159806
CSH Severity: Low
CVSS v4: 5.3 [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]
CVE-ID: CVE-2026-34579
CWE-ID: CWE-201
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated attacker with project-level access to obtain metadata and content from private MantisBT issues they are not authorized to view.
The vulnerability exists due to insufficient authorization enforcement in bug_monitor_add.php when a crafted POST request adds a monitor to a private issue. An authenticated attacker with project-level access can subscribe themselves to the issue and receive update emails even though direct access to the issue remains blocked.
Affected software
MantisBT
How to mitigate CVE-2026-34579
Install security update from vendor's website.
MantisBT - update to 2.28.2