SB2026032741 - Deserialization of Untrusted Data in WatchGuard Fireware OS
Published: March 27, 2026
Security Bulletin ID
SB2026032741
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Deserialization of Untrusted Data (CVE-ID: CVE-2026-4266)
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 update from vendor's website.