CVE-2026-4266

Published: Mar 30, 2026 Last Modified: Mar 30, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 8,4
Source: 5d1c2695-1a31-4499-88ae-e847036fd7e3
Attack Vector: local
Attack Complexity: low
Privileges Required: high
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A

Description

AI Translation Available

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 through 2026.1.2.

Note, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T-15 and T-35.

502

Deserialization of Untrusted Data

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Availability Other
Potential Impacts:
Modify Application Data Unexpected State Dos: Resource Consumption (Cpu) Varies By Context
Applicable Platforms
Languages: Java, JavaScript, PHP, Python, Ruby
Technologies: AI/ML, ICS/OT, Not Technology-Specific
Likelihood of Exploit: Medium
View CWE Details
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00…
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00007