CVE-2026-4266

An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to execute arbitrary code in the context of the portald user.This issue affects Fireware OS: 12.1 through 12.11.8 and 2025.1...

CVE-2026-4266 WatchGuard Firebox Insecure Deserialization in Fireware Access Portal

An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to execute arbitrary code in the context of the portald user. Note, this vulnerability does not affect Firebox platforms that...

PT-2026-29022

Name of the Vulnerable Software and Affected Versions WatchGuard Fireware OS versions 12.1 through 12.11.8 WatchGuard Fireware OS versions 2025.1 through 2026.1.2 Description An Insecure Deserialization issue exists in WatchGuard Fireware OS. An attacker gaining write access to the local filesyst...

CVE-2026-4266: Deserialization of Untrusted Data

An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to execute arbitrary code in the context of the portald user. Note, this vulnerability does not affect Firebox platforms that...