Cross-site scripting in MantisBT - CVE-2026-52881
Published: November 6, 2026
Vulnerability identifier: #VU159813
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-52881
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to steal administrator credentials through a fake login form on a legitimate MantisBT page.
The vulnerability exists due to unescaped user-supplied parameters reflected into HTML by MantisBT's /admin/install.php when the installation page remains accessible. An unauthenticated remote attacker can lure an administrator to a crafted URL and receive credentials submitted through the injected form at an attacker-controlled server.
Affected software
MantisBT
How to mitigate CVE-2026-52881
Install security update from vendor's website.
MantisBT - update to 2.28.4