CVE-2026-43876

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{"affected": [{"affectedData": [{"product": "AVideo", "vendor": "WWBN", "versions": [{"status": "affected", "version": "<= 29.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "WWBN AVideo is an open source video platform. In versions up to and including 29.0, objects/notifySubscribers.json.php takes the raw message POST parameter and passes it into sendSiteEmail(), which substitutes it directly into an HTML email template (via str_replace on the {message} placeholder) and renders it with PHPMailer::msgHTML(). There is no HTML sanitization, character escaping, or output encoding on the attacker-controlled message between $_POST['message'] and the rendered email. Any authenticated user with upload permission can therefore broadcast arbitrary HTML \u2014 phishing links, tracking pixels, CSS/UI spoofing \u2014 to every subscriber on their channel (up to 10,000 recipients per invocation). The email is sent From: the platform's configured contact address and wrapped in the site's official logo and title, so attacker-supplied HTML arrives with the appearance of an official platform communication. Commit https://github.com/WWBN/AVideo/commit/ contains an updated fix."}, {"lang": "es", "value": "WWBN AVideo es una plataforma de video de c\u00f3digo abierto. En versiones hasta la 29.0 inclusive, objects/notifySubscribers.json.php toma el par\u00e1metro POST de mensaje sin procesar y lo pasa a sendSiteEmail(), que lo sustituye directamente en una plantilla de correo electr\u00f3nico HTML (mediante str_replace en el marcador de posici\u00f3n {message}) y lo renderiza con PHPMailer::msgHTML(). No hay sanitizaci\u00f3n HTML, escape de caracteres o codificaci\u00f3n de salida en el mensaje controlado por el atacante entre par\u00e1metro y el correo electr\u00f3nico renderizado. Cualquier usuario autenticado con permiso de carga puede, por lo tanto, difundir HTML arbitrario - enlaces de phishing, p\u00edxeles de seguimiento, suplantaci\u00f3n de CSS/UI - a cada suscriptor de su canal (hasta 10.000 destinatarios por invocaci\u00f3n). El correo electr\u00f3nico se env\u00eda Desde: la direcci\u00f3n de contacto configurada de la plataforma y envuelto en el logotipo y t\u00edtulo oficial del sitio, por lo que el HTML proporcionado por el atacante llega con la apariencia de una comunicaci\u00f3n oficial de la plataforma. El commit https://github.com/WWBN/AVideo/commit/ contiene una correcci\u00f3n actualizada."}], "id": "CVE-2026-43876", "lastModified": "2026-10-26T18:10:00.173", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43876", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-13T14:01:48.068825Z", "version": "2.0.3"}}]}, "published": "2026-05-11T22:22:11.983", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/WWBN/AVideo/commit/078c4342eb9969a70425a9cdca3eefa7f8a86d53"}, {"source": "security-advisories@github.com", "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-g9cm-rxp7-6gv5"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-g9cm-rxp7-6gv5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,29.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "AVideo", "source": "cna", "vendor": "WWBN"}, "product": "avideo", "vendor": "wwbn"}], "created": "2026-05-11T22:45:36.085043+00:00", "updated": "2026-05-11T23:00:19.468419+00:00", "vendors": ["wwbn", "wwbn$PRODUCT$avideo"]}