Medium severity · published May 22, 2026
CVE-2026-40598
MantisBT has Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page
6.9
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
mantisbt · mantisbt
< 2.28.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40598
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40598
github.com
https://github.com/mantisbt/mantisbt/commit/b1ebc57763f104eb5f541b7b4d1ce6948168abd9
github.com
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-6jh4-47v2-4g37
mantisbt.org
https://mantisbt.org/bugs/view.php?id=37017
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