CVE-2026-34579
MantisBT has an authorization bypass in private issue monitoring
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.
How to fix CVE-2026-34579
To remediate CVE-2026-34579, upgrade the affected package to a fixed version below.
- —upgrade to 2.28.2 or later
Is CVE-2026-34579 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 2.26.1, < 2.28.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |