CVE-2026-3343
Received Received - Intake
Reflected XSS in Fireware OS Web UI Enables Script Execution

Publication date: 2026-03-03

Last updated on: 2026-03-04

Assigner: WatchGuard Technologies, Inc.

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. This vulnerability affects Fireware OS 12.7 up to and including 12.11.7 and 2025.1 up to and including 2026.1.1.
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Meta Information
Published
2026-03-03
Last Modified
2026-03-04
Generated
2026-06-16
AI Q&A
2026-03-03
EPSS Evaluated
2026-06-15
NVD
CVE-2026-3343
EUVD
EUVD-2026-9289
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
watchguard fireware From 12.7 (inc) to 12.11.8 (exc)
watchguard fireware From 2025.1 (inc) to 2026.1.2 (exc)
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.
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Executive Summary

This vulnerability is a reflected cross-site scripting (XSS) issue in the Fireware OS Web UI. It allows malicious JavaScript code to be executed in the browser of an authenticated management user when they click on a specially crafted link.

Impact Analysis

The vulnerability can lead to the execution of malicious scripts in the context of an authenticated user's browser. This can result in unauthorized actions being performed on behalf of the user, theft of sensitive information, session hijacking, or other malicious activities that compromise the security of the management interface.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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