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CVE-2026-3343— WatchGuard Firebox Reflected Cross-Site-Scripting (XSS) Vulnerability in Fireware Web UI

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 12.7至12.11.7版本和2025.1至2026.1.1版本存在安全漏洞，该漏洞源于Fireware OS Web UI存在反射型跨站脚本，可能导致经过身份验证的管理用户在点击特制链接时，在其浏览器环境中执行恶意JavaScript。

CVSS 5.1 · Medium EPSS 0.21% · P11

Affected Version Matrix 2

VendorProduct Version RangeStatus
WatchGuard Fireware OS 2025.1< 2026.1.2 affected
12.7< 12.11.8 affected
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I. Basic Information for CVE-2026-3343

Vulnerability Information
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Vulnerability Title
WatchGuard Firebox Reflected Cross-Site-Scripting (XSS) Vulnerability in Fireware Web UI
Source: CVE Program / CVE List V5
Vulnerability Description
A reflected cross-site scripting (XSS) vulnerability in the Fireware OS Web UI enabled execution of malicious JavaScript in the context of an authenticated management user's browser when they click on a specially crafted link.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
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 12.7至12.11.7版本和2025.1至2026.1.1版本存在安全漏洞，该漏洞源于Fireware OS Web UI存在反射型跨站脚本，可能导致经过身份验证的管理用户在点击特制链接时，在其浏览器环境中执行恶意JavaScript。
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 ~ 2026.1.2 -

II. Public POCs for CVE-2026-3343

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III. Intelligence Information for CVE-2026-3343

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Vendor Advisories for CVE-2026-3343 (2)

Same Patch Batch · WatchGuard · 2026-03-03 · 3 CVEs total

CVE-2026-3344 6.9 MEDIUM WatchGuard Firebox System Integrity Check Bypass
CVE-2026-3342 WatchGuard Firebox Out of Bounds Write Vulnerability

IV. Related Vulnerabilities

Same product: Fireware OS
Same vendor: WatchGuard
Same weakness: CWE-79

V. Comments for CVE-2026-3343

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