What is CVE-2025-55420?

CVE-2025-55420 is a high-severity vulnerability in Foxcms, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2025-08-21.

How severe is CVE-2025-55420?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2025-55420 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Foxcms

CVE-2025-55420

A Reflected Cross Site Scripting (XSS) vulnerability was found in /index.php in FoxCMS v1.2.6. When a crafted script is sent via a GET request, it is reflected unsanitized into the HTML response. This permits execution of arbitrary JavaScript code when a logged-in user submits the malicious input.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.005 (39.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Foxcms — versions 1.2.6
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-55420?: CVE-2025-55420 is a high-severity vulnerability in Foxcms, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2025-08-21.
How severe is CVE-2025-55420?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2025-55420 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.