CVE-2026-34754 PUBLISHED

MantisBT allows unauthorized users to upload attachments to restricted issues via REST API

Assigner: GitHub_M
Reserved: 30.03.2026 Published: 19.05.2026 Updated: 20.05.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS Score: 4.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	mantisbt
Product	mantisbt
Versions	Version < 2.28.2 is affected

References

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-h4x5-gvx6-3rwc
https://github.com/mantisbt/mantisbt/commit/b262b4d2835b81394d75356dead66e52a6275206
https://mantisbt.org/bugs/view.php?id=36976

Problem Types

CWE-284: Improper Access Control CWE