CVE-2026-34754
MantisBT has an Authorization Bypass that Allows Uploading Attachments to Private Issues via REST API
4.3
MEDIUM
CVSS 3.1
EPSS 0.03%
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.
How to fix CVE-2026-34754
To remediate CVE-2026-34754, upgrade the affected package to a fixed version below.
- —upgrade to 2.28.2 or later
Is CVE-2026-34754 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 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 |