CVE-2026-43874

{
  "id": "CVE-2026-43874",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-11T21:19:02.120",
  "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, the server-side mitigation for the YPTSocket autoEvalCodeOnHTML eval sink (from CVE-2026-40911) only strips the payload when it sits under $json['msg'], but the relay function msgToResourceId() selects the outbound message from $msg['json'] before $msg['msg']. An unauthenticated attacker can obtain a WebSocket token from plugin/YPTSocket/getWebSocket.json.php, connect to the WebSocket server, and send a message with autoEvalCodeOnHTML nested under a top-level json field — the strip branch is skipped, the relay delivers the payload verbatim to any logged-in user identified by to_users_id, and the client script runs it through eval(). Commit 9f3006f9a89a34daa67a83c6ad35f450cb91fcce contains an updated fix."
    },
    {
      "lang": "es",
      "value": "WWBN AVideo es una plataforma de video de código abierto. En versiones hasta la 29.0 inclusive, la mitigación del lado del servidor para el eval sink autoEvalCodeOnHTML de YPTSocket (de CVE-2026-40911) solo elimina la carga útil cuando se encuentra bajo $json[’msg’], pero la función de retransmisión msgToResourceId() selecciona el mensaje saliente de $msg[’json’] antes de $msg[’msg’]. Un atacante no autenticado puede obtener un token de WebSocket de plugin/YPTSocket/getWebSocket.json.php, conectarse al servidor WebSocket y enviar un mensaje con autoEvalCodeOnHTML anidado bajo un campo json de nivel superior - la rama de eliminación se omite, la retransmisión entrega la carga útil textualmente a cualquier usuario conectado identificado por to_users_id, y el script del cliente lo ejecuta a través de eval(). El commit 9f3006f9a89a34daa67a83c6ad35f450cb91fcce 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:C/C:L/I:L/A:N",
          "baseScore": 7.2,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-12T13:23:59.294265Z",
          "id": "CVE-2026-43874",
          "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-94"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/WWBN/AVideo/commit/9f3006f9a89a34daa67a83c6ad35f450cb91fcce",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-ghcv-22jf-vfxm",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-ghcv-22jf-vfxm",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}