CVE-2026-43880

{
  "id": "CVE-2026-43880",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-11T22:22:12.530",
  "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/sendEmail.json.php exposes two branches depending on whether contactForm=1 is submitted. When the parameter is omitted, the endpoint sets $sendTo to an attacker-supplied email and, for unauthenticated callers, uses the site's own contact email as the message From:/Reply-To:. The endpoint is explicitly allow-listed as a \"public write action\" in objects/functionsSecurity.php (line 885), so it requires no authentication or CSRF token. An unauthenticated attacker (solving a captcha) can force the site's own SMTP infrastructure to send attacker-composed emails to arbitrary recipients with the site's legitimate sender address, passing SPF/DKIM/DMARC for the site's domain — ideal for targeted phishing and brand impersonation. Commit 4e3709895857a5857f0edb46b0ee984de0d9e1a2 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/sendEmail.json.php expone dos ramas dependiendo de si se envía contactForm=1. Cuando se omite el parámetro, el endpoint establece $sendTo a un correo electrónico proporcionado por el atacante y, para los llamantes no autenticados, utiliza el propio correo electrónico de contacto del sitio como From:/Reply-To: del mensaje. El endpoint está explícitamente en la lista de permitidos como una ’acción de escritura pública’ en objects/functionsSecurity.php (línea 885), por lo que no requiere autenticación ni token CSRF. Un atacante no autenticado (resolviendo un captcha) puede forzar la propia infraestructura SMTP del sitio a enviar correos electrónicos compuestos por el atacante a destinatarios arbitrarios con la dirección de remitente legítima del sitio, pasando SPF/DKIM/DMARC para el dominio del sitio - ideal para phishing dirigido e suplantación de marca. El commit 4e3709895857a5857f0edb46b0ee984de0d9e1a2 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:N/UI:N/S:U/C:N/I:L/A:N",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-12T12:55:28.626058Z",
          "id": "CVE-2026-43880",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-940"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/WWBN/AVideo/commit/4e3709895857a5857f0edb46b0ee984de0d9e1a2",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-5hgj-7gm9-cff5",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-5hgj-7gm9-cff5",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}