CVE-2026-44655 MantisBT: Stored XSS on Move Attachments Admin Page
An attacker with manager or admin access can inject HTML into the Move Attachments admin page via unescaped project names, potentially leading to script execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44655?
CVE-2026-44655 is a high-severity cross-site scripting vulnerability in mantisbt, published on 28 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. From 1.3.0 to 2.28.1, unescaped Project Name allows an attacker that can set it (which typically requires manager or administrator access level) to inject HTML in Move Attachments admin page. This vulnerability is fixed in 2.28.2.
Weakness: CWE-79
Which versions are affected by CVE-2026-44655?
2 open source packages ship an affected version, including mantisbt/mantisbt.
| Package | Affected | Fixed in |
|---|---|---|
mantisbt/mantisbt Packagist | From 1.3.0 | 2.28.2 |
mantisbt/mantisbt Packagist | From 1.3.0 | 2.28.2 |
How do I fix CVE-2026-44655?
Upgrade mantisbt/mantisbt to 2.28.2 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-44655 being exploited?
There is no known exploitation of CVE-2026-44655 in the wild and no public exploit code.
Sources
Also known as GHSA-7mqj-8gj2-cg59.