What is CVE-2025-13939?

CVE-2025-13939 is a medium-severity vulnerability in Watchguard Fireboxcloud, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-12-04.

How severe is CVE-2025-13939?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Watchguard Fireboxcloud

CVE-2025-13939

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WatchGuard Fireware OS (Gateway Wireless Controller module) allows Stored XSS.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (5.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Watchguard Fireboxcloud
Watchguard Firebox_m270
Watchguard Firebox_m290
Watchguard Firebox_m370
Watchguard Firebox_m390
Watchguard Firebox_m440
Watchguard Firebox_m4600
Watchguard Firebox_m470
Watchguard Firebox_m4800
Watchguard Firebox_m5600

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

5d1c2695-1a31-4499-88ae-e847036fd7e3 (vendor-advisory, Vendor Advisory)
5d1c2695-1a31-4499-88ae-e847036fd7e3 (vendor-advisory)

Frequently asked questions

What is CVE-2025-13939?: CVE-2025-13939 is a medium-severity vulnerability in Watchguard Fireboxcloud, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-12-04.
How severe is CVE-2025-13939?: Medium severity. CVSS v3 base score is 6.1 out of 10.