What is the severity of CVE-2025-1239?

CVE-2025-1239 is classified as a stored Cross-site Scripting (XSS) vulnerability with high severity.

How do I fix CVE-2025-1239?

To mitigate CVE-2025-1239, ensure you upgrade to a patched version of WatchGuard Fireware OS beyond the affected versions listed.

What versions of WatchGuard Fireware OS are affected by CVE-2025-1239?

CVE-2025-1239 affects WatchGuard Fireware OS versions from 12.0 up to 12.11 and 12.5.12.

Who needs to be concerned about CVE-2025-1239?

Authenticated administrators managing a locally managed Firebox should be particularly concerned about CVE-2025-1239.

Vulnerability/
CVE-2025-1239

medium

4.8

CWE

14/2/2025

CVE-2025-1239: WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in Blocked Sites List

Q: What causes the vulnerability CVE-2025-1239?

CVE-2025-1239 is caused by improper neutralization of input during web page generation allowing for stored XSS.

First published: Fri Feb 14 2025(Updated: )

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS allows Stored XSS via the Blocked Sites list. This vulnerability requires an authenticated administrator session to a locally managed Firebox.This issue affects Fireware OS: from 12.0 through 12.5.12+701324, from 12.6 through 12.11.

Credit: 5d1c2695-1a31-4499-88ae-e847036fd7e3

Affected Software	Affected Version	How to fix
WatchGuard Fireware OS	>=12.0<12.5.12>=12.6<12.11

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Reference Links

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00002

Frequently Asked Questions

What is the severity of CVE-2025-1239?
CVE-2025-1239 is classified as a stored Cross-site Scripting (XSS) vulnerability with high severity.
How do I fix CVE-2025-1239?
To mitigate CVE-2025-1239, ensure you upgrade to a patched version of WatchGuard Fireware OS beyond the affected versions listed.
What versions of WatchGuard Fireware OS are affected by CVE-2025-1239?
CVE-2025-1239 affects WatchGuard Fireware OS versions from 12.0 up to 12.11 and 12.5.12.
What causes the vulnerability CVE-2025-1239?
CVE-2025-1239 is caused by improper neutralization of input during web page generation allowing for stored XSS.
Who needs to be concerned about CVE-2025-1239?
Authenticated administrators managing a locally managed Firebox should be particularly concerned about CVE-2025-1239.

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