CVE-2026-4266— WatchGuard Firebox Insecure Deserialization in Fireware Access Portal
Quick assessment
Affected
WatchGuard Fireware OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
WatchGuard Fireware OS是美国WatchGuard公司的一个在 Firebox 上运行的软件。 WatchGuard Fireware OS 12.1至12.11.8版本和2025.1至2026.1.2版本存在安全漏洞，该漏洞源于不安全的反序列化，可能导致在portald用户环境下执行任意代码。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| WatchGuard | Fireware OS | 2025.1< 2026.2 |
affected |
12.1< 12.12 |
affected | ||
12.1< 12.11.9 |
affected |
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I. Basic Information for CVE-2026-4266
Vulnerability Information
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Vulnerability Title
WatchGuard Firebox Insecure Deserialization in Fireware Access Portal
Source: CVE Program / CVE List V5
Vulnerability Description
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 do not support the Access Portal feature, including the T15 and T35.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
WatchGuard Fireware OS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WatchGuard Fireware OS是美国WatchGuard公司的一个在 Firebox 上运行的软件。 WatchGuard Fireware OS 12.1至12.11.8版本和2025.1至2026.1.2版本存在安全漏洞，该漏洞源于不安全的反序列化，可能导致在portald用户环境下执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| WatchGuard | Fireware OS | 2025.1 ~ 2026.2 | - |
|
| WatchGuard | Fireware OS | 12.1 ~ 12.11.9 | - |
|
II. Public POCs for CVE-2026-4266
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-4266 (2)
-
🔗 404 - File Not Found | WatchGuard Technologies vendor-advisory
-
IV. Related Vulnerabilities
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-
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Same weakness: CWE-502
-
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V. Comments for CVE-2026-4266
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