How serious is CVE-2026-3343?

This vulnerability has a CVSS score of 5.1 out of 10, classified as MEDIUM severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-3343?

Yes, proof-of-concept exploit code for CVE-2026-3343 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-3343?

CVE-2026-3343 affects watchguard fireware. Check the full CVE details for specific version information.

How do I fix CVE-2026-3343?

To remediate CVE-2026-3343, check for security patches from watchguard. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-3343

Medium

|5.1

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

An attacker can trick an authenticated management user of Fireware OS into executing harmful JavaScript by clicking on a specially crafted link, potentially compromising their session or stealing sensitive information. This vulnerability affects specific versions of Fireware OS and requires the user to be logged in to the management interface when they click the link.

Technical 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.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

Confidentiality ImpactHigh

Integrity ImpactHigh

Availability ImpactHigh

ScopeChanged

Vector String

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$690($500-$1K)

Vendor Response

Grade APatched in 1 day

Quick Information

Published

Mar 3, 2026

about 1 month ago

Last Modified

Mar 4, 2026

about 1 month ago

Vendor

watchguard

Product

fireware

Related Vulnerabilities

CVE-2026-3344Medium

An attacker can exploit a flaw in WatchGuard Fireware OS to bypass security checks on the system's files, allowing them to install a malicious firmware update that can maintain limited control over the device. This vulnerability affects specific versions of Fireware OS and requires the attacker to craft a specially designed firmware package to take advantage of it.

CVE-2026-3342High

This vulnerability allows an attacker with administrative access to the WatchGuard Fireware OS to run any code they want with full control over the system. It affects specific versions of the software and requires the attacker to be logged in as a privileged administrator to exploit it.