What is the CVSS score of CVE-2025-55420?

CVE-2025-55420 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of PHP are affected by CVE-2025-55420?

Organizations using FoxCMS face significant risk from CVE-2025-55420, a cross-site scripting vulnerability rated CVSS 8.8.

Is there a public PoC exploit available for CVE-2025-55420?

Yes, a public proof-of-concept exploit is available for CVE-2025-55420. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-55420?

Within 7 days: Identify all affected systems running FoxCMS and apply vendor patches promptly. Verify anti-CSRF tokens and content security policies are enforced.

PHP CVE-2025-55420

HIGH

Cross-site Scripting (XSS) (CWE-79)

2025-08-21 cve@mitre.org

PHP XSS Foxcms

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:08 vuln.today

PoC Detected

Sep 09, 2025 - 19:12 vuln.today

Public exploit code

CVE Published

Aug 21, 2025 - 16:15 nvd

HIGH 8.8

DescriptionCVE.org

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.

AnalysisAI

A Reflected Cross Site Scripting (XSS) vulnerability was found in /index.php in FoxCMS v1.2.6. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. 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. Affected products include: Foxcms.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

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CVE-2025-55420 vulnerability details – vuln.today

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PHP CVE-2025-55420

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code