CVE-2026-40598
Medium
Description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, improper escaping of the redirection page (retrieved from the request's Referer header) allows an attacker to inject HTML. While this is generally not directly actionable as modern browsers will URL-encode special characters, on some specific server configurations this could poison the cache, leading to cross-site scripting. This issue has been fixed in version 2.28.2.
SeverityMedium
CVSS6.9
Exploit probability—
ProductMantisbt/mantisbt
PublishedMay 22, 2026
First seenMay 22, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- mantisbt/mantisbt2.28.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mantisbt/mantisbtPackagist | v < 2.28.2 | 2.28.2 |
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