CVE-2026-41897 MantisBT: Reflected XSS in Rendering Dynamic Custom Textarea Field
Attackers can inject arbitrary HTML via the filter_target parameter in MantisBT, potentially leading to session hijacking or malicious script execution.
- 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-2026-41897?
CVE-2026-41897 is a medium-severity cross-site scripting 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. From 1.0.0 to 2.28.1, lack of validation of filter_target parameter on return_dynamic_filters.php (normally used as an AJAX in View Issues Page) allows an attacker to inject arbitrary HTML if the target is a TEXTAREA custom field. This vulnerability is fixed in 2.28.2.
Weakness: CWE-79
Which versions are affected by CVE-2026-41897?
2 open source packages ship an affected version, including mantisbt/mantisbt.
| Package | Affected | Fixed in |
|---|---|---|
mantisbt/mantisbt Packagist | From 1.0.0 | 2.28.2 |
mantisbt/mantisbt Packagist | From 1.0.0 | 2.28.2 |
How do I fix CVE-2026-41897?
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-2026-41897 being exploited?
There is no known exploitation of CVE-2026-41897 in the wild and no public exploit code.
Sources
Also known as GHSA-j7v9-f46r-2rp4.