CVE-2026-40596
High
Description
Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.11.0 through 2.28.1 allow any authenticated user to inject arbitrary HTML by updating their account's font family. Upon exploitation, an XSS payload would be reflected on every MantisBT page. Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover. This issue has been fixed in version 2.28.2.
SeverityHigh
CVSS7.2
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 | 2.11.0 ≤ v < 2.28.2 | 2.28.2 |
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