CVE-2026-40598CWE-79

MantisBT has Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page

Medium · published May 22, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
43.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00525 · 43.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-05-22T19:32Z
EPSS history
Timeline
  • 22 MAY 19:32Z
    MantisBT has Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page
    cvelistv5