CVE-2026-42070 MantisBT: Authorization Bypass in Bugnote Editing via Issue Update API
Attackers with updater privileges can modify other users' bugnotes via the API, bypassing stricter authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42070?
CVE-2026-42070 is a medium-severity missing authorization vulnerability in mantisbt, published on 28 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Prior to 2.28.2, the mc_issue_update() function in MantisBT allows users having update_bug_threshold access (UPDATER, with default settings) to edit, change view state, and modify time tracking on bugnotes belonging to other users — bypassing the default DEVELOPER (level 55) threshold required by the dedicated mc_issue_note_update() function. This vulnerability is fixed in 2.28.2.
Weakness: CWE-863
Which versions are affected by CVE-2026-42070?
2 open source packages ship an affected version, including mantisbt/mantisbt.
| Package | Affected | Fixed in |
|---|---|---|
mantisbt/mantisbt Packagist | All versions | 2.28.2 |
mantisbt/mantisbt Packagist | All versions | 2.28.2 |
How do I fix CVE-2026-42070?
Upgrade mantisbt/mantisbt to 2.28.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-42070 being exploited?
There is no known exploitation of CVE-2026-42070 in the wild and no public exploit code.
Sources
Also known as GHSA-pq86-j2c2-47f6.