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CVE-2025-1239

WatchGuard Firebox Stored Cross-Site-Scripting (XSS) Vulnerability in Blocked Sites List

MEDIUM
4.8
CVSS Score
Published: February 14, 2025 at 01:21 PM UTC
Updated: August 8, 2026 at 03:29 AM UTC
1 product affected across 1 vendorFireware

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fireware· WatchGuard
60%
12.0 ≤ v < 12.11.112.0 ≤ v < 12.5.1312.0
Affected range stops below 12.11.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.5.13, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Source: 5d1c2695-1a31-4499-88ae-e847036fd7e3
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00002
Vendor Advisory
Source: cverecord
https://psirt.watchguard.com/CVE-2025-1239

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMWatchGuard
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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