CVE-2026-40596CWE-79

MantisBT is vulnerable to XSS and potential account takeover via user font family preference update

High · published May 22, 2026

CVSS v4.0
7.2
EPSS
0%
Percentile
41.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.2 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L
EPSS
0.00499 · 41.5th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-05-22T19:25Z
EPSS history
Timeline
  • 22 MAY 19:25Z
    MantisBT is vulnerable to XSS and potential account takeover via user font family preference update
    cvelistv5