Reflected XSS Vulnerability in Fireware OS by WatchGuard
CVE-2026-3343

5.1MEDIUM

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
3 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-3343?

A reflected cross-site scripting (XSS) vulnerability exists in the Fireware OS Web UI, allowing attackers to execute malicious JavaScript code in the browser of an authenticated management user. This occurs when the user interacts with specially constructed links, potentially exposing sensitive information or allowing further exploitation of the user's session.

Affected Version(s)

Fireware OS 12.7 <= 12.11.7

Fireware OS 2025.1 <= 2026.1.1

References

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-...

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

btaol
.