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CVE-2026-13377— WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in SIP Proxy Configuration

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公司的一款网络防火墙的操作系统。 WatchGuard Fireware OS存在跨站脚本漏洞，该漏洞源于SIP Proxy模块在Web页面生成过程中对输入中和不当，允许存储型跨站脚本攻击。以下版本受到影响：12.0版本至12.12版本、12.5版本至12.5.18版本和2025.1版本至2026.2版本。

CVSS 4.8 · Medium EPSS 0.17% · P7

Affected Version Matrix 3

VendorProduct Version RangeStatus
WatchGuard Fireware OS 2025.1< 2026.2.1 affected
12.0< 12.12.1 affected
12.0< 12.5.19 affected
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I. Basic Information for CVE-2026-13377

Vulnerability Information
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Vulnerability Title
WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in SIP Proxy Configuration
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS SIP Proxy module allows Stored XSS. This vulnerability is an additional unmitigated attack path for CVE-2025-6947.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WatchGuard Fireware OS是美国WatchGuard公司的一款网络防火墙的操作系统。 WatchGuard Fireware OS存在跨站脚本漏洞，该漏洞源于SIP Proxy模块在Web页面生成过程中对输入中和不当，允许存储型跨站脚本攻击。以下版本受到影响：12.0版本至12.12版本、12.5版本至12.5.18版本和2025.1版本至2026.2版本。
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 ~ 2026.2.1 -
WatchGuard Fireware OS 12.0 ~ 12.5.19 -

II. Public POCs for CVE-2026-13377

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III. Intelligence Information for CVE-2026-13377

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Vendor Advisories for CVE-2026-13377 (2)

Same Patch Batch · WatchGuard · 2026-07-02 · 17 CVEs total

CVE-2026-13368 9.2 CRITICAL WatchGuard Firebox Race Condition and Use-After-Free in Mobile VPN with IKEv2 LDAP Authent
CVE-2026-13084 8.7 HIGH Null Pointer Dereference in WatchGuard Fireware OS iked Process
CVE-2026-13722 8.6 HIGH WatchGuard Firebox Firmware Image Validation Bypass in WatchGuard Fireware OS
CVE-2026-13383 8.6 HIGH WatchGuard Firebox ikestubd Out of Bounds Write Vulnerability
CVE-2026-13053 8.6 HIGH WatchGuard Firebox Authenticated Out of Bounds Write in Management CLI Command Handler
CVE-2026-13050 8.6 HIGH WatchGuard Firebox networkd Out of Bounds Write Vulnerability
CVE-2026-13054 8.6 HIGH WatchGuard Firebox Arbitrary File Write via Path Traversal in Management Web UI
CVE-2026-13384 8.6 HIGH WatchGuard Firebox wgagent Out of Bounds Write Vulnerability
CVE-2026-8247 7.7 HIGH WatchGuard Firebox admd Out of Bounds Write Vulnerability
CVE-2026-13079 7.3 HIGH WatchGuard Mobile VPN with SSL Windows Client Local Privilege Escalation
CVE-2026-13371 6.9 MEDIUM WatchGuard Firebox Management Web UI Denial of Service via Unsafe Deserialization
CVE-2026-13728 5.9 MEDIUM WatchGuard Firebox Hardcoded Fallback Encryption Key in Access Portal Resource Credential
CVE-2026-13373 4.8 MEDIUM WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in Tigerpaw Technology
CVE-2026-13376 4.8 MEDIUM WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in spamBlocker Module
CVE-2026-13375 4.8 MEDIUM WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in Autotask Technology
CVE-2026-13374 4.8 MEDIUM WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in ConnectWise Technolo

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-13377

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