CVE-2026-43876

{
  "id": "CVE-2026-43876",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-11T22:22:11.983",
  "lastModified": "2026-10-26T18:10:00.173",
  "vulnStatus": "Deferred",
  "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 — phishing links, tracking pixels, CSS/UI spoofing — 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 código abierto. En versiones hasta la 29.0 inclusive, objects/notifySubscribers.json.php toma el parámetro POST de mensaje sin procesar y lo pasa a sendSiteEmail(), que lo sustituye directamente en una plantilla de correo electrónico HTML (mediante str_replace en el marcador de posición {message}) y lo renderiza con PHPMailer::msgHTML(). No hay sanitización HTML, escape de caracteres o codificación de salida en el mensaje controlado por el atacante entre parámetro  y el correo electrónico renderizado. Cualquier usuario autenticado con permiso de carga puede, por lo tanto, difundir HTML arbitrario - enlaces de phishing, píxeles de seguimiento, suplantación de CSS/UI - a cada suscriptor de su canal (hasta 10.000 destinatarios por invocación). El correo electrónico se envía Desde: la dirección de contacto configurada de la plataforma y envuelto en el logotipo y título oficial del sitio, por lo que el HTML proporcionado por el atacante llega con la apariencia de una comunicación oficial de la plataforma. El commit https://github.com/WWBN/AVideo/commit/ contiene una corrección actualizada."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "WWBN",
          "product": "AVideo",
          "versions": [
            {
              "version": "<= 29.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 2.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-13T14:01:48.068825Z",
          "id": "CVE-2026-43876",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/WWBN/AVideo/commit/078c4342eb9969a70425a9cdca3eefa7f8a86d53",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-g9cm-rxp7-6gv5",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-g9cm-rxp7-6gv5",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}