CVE-2026-13377
Received Received - Intake

Stored XSS in WatchGuard Fireware OS SIP Proxy

Publication date: 2026-07-03

Last updated on: 2026-07-03

Assigner: WatchGuard Technologies, Inc.

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. This issue affects Fireware OS 12.0 up to and including 12.12, 12.5 up to and including 12.5.18, and 2025.1 up to and including 2026.2.

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Meta Information

Published
2026-07-03
Last Modified
2026-07-03
Generated
2026-07-03
AI Q&A
2026-07-03
EPSS Evaluated
N/A
NVD
CVE-2026-13377
EUVD
EUVD-2026-41452

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
watchguard fireware_os to 12.12 (inc)
watchguard fireware_os to 12.5.18 (inc)
watchguard fireware_os to 2026.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

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Executive Summary

This vulnerability is a Stored Cross-site Scripting (XSS) issue in the WatchGuard Fireware OS SIP Proxy module. It occurs due to improper neutralization of input during web page generation, allowing malicious scripts to be stored and executed in the context of the affected application.

It is an additional unmitigated attack path related to a previously identified vulnerability, CVE-2025-6947.

Impact Analysis

An attacker exploiting this Stored XSS vulnerability could execute malicious scripts in the context of the affected Fireware OS SIP Proxy module. This could lead to unauthorized actions, data theft, or session hijacking for users interacting with the vulnerable system.

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