Cross-site scripting in MantisBT - CVE-2026-40596
Published: November 6, 2026
Vulnerability identifier: #VU159801
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-40596
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated attacker to inject HTML into MantisBT pages and achieve account takeover when combined with a separate content security policy bypass.
The vulnerability exists due to improper neutralization of the account font family preference when MantisBT renders pages. An authenticated attacker can save a malicious font family value that is included in every subsequently viewed MantisBT page.
Affected software
MantisBT
How to mitigate CVE-2026-40596
Install security update from vendor's website.
MantisBT - update to 2.28.2