Vulnerability · Published May 19, 2026 · Assigned by GitHub_M
CVE-2026-34754MantisBT allows unauthorized users to upload attachments to restricted issues via REST API
Medium 4.3
In plain English
A medium-severity improper access control in mantisbt from mantisbt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.2%top 83.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior allow an authenticated user to upload attachments to private Issues they are not authorized to access. This issue has been fixed in version 2.28.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | mantisbt/mantisbt | 2.28.2 | GHSA-h4x5-gvx6-3rwc |
Affected products (as reported)
Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
References
- https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc x_refsource_CONFIRM
- https://github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a6275206 x_refsource_MISC
- https://mantisbt.org/bugs/view.php?id=36976 x_refsource_MISC