#VU124662 Deserialization of Untrusted Data in Fireware OS - CVE-2026-4266

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Main Vulnerability Database Vulnerabilities #VU124662

#VU124662 Deserialization of Untrusted Data in Fireware OS - CVE-2026-4266

Published: March 27, 2026


Vulnerability identifier: #VU124662
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-4266
CWE-ID: CWE-502
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
Fireware OS
Software vendor:
WatchGuard

Description

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data in Fireware Access Portal. A local administrator 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.


Remediation

Install updates from vendor's website.

External links