Deserialization of Untrusted Data in Web Help Desk - CVE-2025-26399
Published: September 23, 2025 / Updated: March 9, 2026
Vulnerability identifier: #VU116030
CSH Severity: Critical
CVSS v4.0: 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/E:A/U:Red
CVE-ID: CVE-2025-26399
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: SolarWinds
Affected software:
Web Help Desk
Web Help Desk
Detailed vulnerability description
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 within the AjaxProxy. A remote attacker can pass 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.
Note, the vulnerability exists due to unsuccessful patching addressed in #VU98770 (CVE-2024-28988) and #VU96009 (CVE-2024-28986).
How to mitigate CVE-2025-26399
Install updates from vendor's website.