Cross-site scripting in MantisBT - CVE-2026-52847
Published: November 6, 2026
Vulnerability identifier: #VU159815
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-2026-52847
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 displayed on a legitimate MantisBT page.
The vulnerability exists due to unescaped user-supplied parameters reflected into HTML by print_test_result() in /admin/install.php when the installer remains accessible. An unauthenticated remote attacker can send a crafted URL to an administrator who opens it and submits credentials to an attacker-controlled server.
Affected software
MantisBT
How to mitigate CVE-2026-52847
Install security update from vendor's website.
MantisBT - update to 2.28.4