CVE-2026-42193

{
  "id": "CVE-2026-42193",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-08T22:16:31.273",
  "lastModified": "2026-10-26T18:10:00.173",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Plunk is an open-source email platform built on top of AWS SES. Prior to version 0.9.0, the /webhooks/sns endpoint accepts Amazon SNS notification payloads from unauthenticated requests without verifying the SNS signature, certificate, or topic ARN, meaning anyone can forge a valid-looking webhook request. This allows an unauthenticated attacker to spoof SNS events to trigger workflow automations, unsubscribe contacts, manipulate email delivery metrics, and potentially exhaust billing credits. This issue has been patched in version 0.9.0."
    },
    {
      "lang": "es",
      "value": "Plunk es una plataforma de correo electrónico de código abierto construida sobre AWS SES. Antes de la versión 0.9.0, el endpoint /webhooks/sns acepta cargas útiles de notificación de Amazon SNS de solicitudes no autenticadas sin verificar la firma de SNS, el certificado o el ARN del tema, lo que significa que cualquiera puede falsificar una solicitud de webhook de apariencia válida. Esto permite a un atacante no autenticado suplantar eventos de SNS para activar automatizaciones de flujo de trabajo, cancelar la suscripción de contactos, manipular métricas de entrega de correo electrónico y potencialmente agotar los créditos de facturación. Este problema ha sido parcheado en la versión 0.9.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "useplunk",
          "product": "plunk",
          "versions": [
            {
              "version": "< 0.9.0",
              "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:H/A:H",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-11T18:05:40.960607Z",
          "id": "CVE-2026-42193",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/useplunk/plunk/releases/tag/v0.9.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/useplunk/plunk/security/advisories/GHSA-9792-w86v-gx53",
      "source": "[email protected]"
    }
  ]
}