Deserialization of Untrusted Data in Web Help Desk - CVE-2025-40551
Published: January 30, 2026 / Updated: February 13, 2026
Vulnerability identifier: #VU122156
CSH Severity: Critical
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-40551
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data. A remote non-authenticated attacker can send specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Web Help Desk
How to mitigate CVE-2025-40551
Install updates from vendor's website.
Web Help Desk - update to 2026.1