CVE-2026-34754

MEDIUM4.3EPSS 0.03%

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

Published: 5/11/2026Modified: 5/11/2026

Description

### 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.

Affected packages (1)

Packagist/mantisbt/mantisbtfrom 0, < 2.28.2

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References (4)

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