GHSA-h4x5-gvx6-3rwc

MantisBT has an Authorization Bypass that Allows Uploading Attachments to Private Issues via REST API

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-34754

Packages

Ecosystem	Package	Affected	Fixed in
Packagist	mantisbt/mantisbt	< 2.28.2	2.28.2

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact MantisBT allows an authenticated user to upload attachments to private Issues they are not authorized to access. ### Patches - b262b4d2835b81394d75356dead66e52a6275206 ### Workarounds None. ### Credits Thanks to Vishal Shukla for discovering and responsibly reporting the issue.

References

External links from the advisory. They lead to third-party sites.

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc web
https://nvd.nist.gov/vuln/detail/CVE-2026-34754 advisory
https://github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a6275206 web
https://github.com/mantisbt/mantisbt package
https://mantisbt.org/bugs/view.php?id=36976 web