Eval Injection in MantisBT - CVE-2026-49273
Published: November 8, 2026
Vulnerability identifier: #VU161889
CSH Severity: Low
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-49273
CWE-ID: CWE-95
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an administrator to execute arbitrary code as the web server user on a MantisBT server.
The vulnerability exists due to unsafe evaluation of non-string configuration values in adm_config_set.php, where PHP class declarations take effect despite a return statement intended to prevent execution. An administrator can submit a crafted value through the Manage Configuration web interface to define a class that hijacks a subsequently loaded class and executes attacker-controlled code.
Affected software
MantisBT
How to mitigate CVE-2026-49273
Install security update from vendor's website.
MantisBT - update to 2.28.4