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CVE-2020-3126

Estado: ModificadaBaja (3.5)—

vulnerability within the Multimedia Viewer feature of Cisco Webex Meetings could allow an authenticated, remote attacker to bypass security protections. The vulnerability is due to missing security warning dialog boxes when a room host views shared multimedia files. An authenticated, remote attacker could exploit this vulnerability by using the host role to share files within the Multimedia sharing feature and convincing a former room host to view that file.

Leer descripción completaMostrar menos

A warning dialog normally appears cautioning users before the file is displayed; however, the former host would not see that warning dialog, and any shared multimedia would be rendered within the user's browser. The attacker could leverage this behavior to conduct additional attacks by including malicious files within a targeted room host's browser window.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Fuente: mapeo oficial MITRE CTID (CVE → ATT&CK).

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionExploit ProtectionVulnerability ScanningUser TrainingRestrict File and Directory PermissionsPrivileged Account Management

Tecnologías afectadas (1)

Cisco — Webex Meetings Server

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2020-3126",
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  "metrics": {
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  "published": "2020-04-13T17:15:11.093",
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      "value": "vulnerability within the Multimedia Viewer feature of Cisco Webex Meetings could allow an authenticated, remote attacker to bypass security protections. The vulnerability is due to missing security warning dialog boxes when a room host views shared multimedia files. An authenticated, remote attacker could exploit this vulnerability by using the host role to share files within the Multimedia sharing feature and convincing a former room host to view that file. A warning dialog normally appears cautioning users before the file is displayed; however, the former host would not see that warning dialog, and any shared multimedia would be rendered within the user's browser. The attacker could leverage this behavior to conduct additional attacks by including malicious files within a targeted room host's browser window."
    },
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      "lang": "es",
      "value": "Una vulnerabilidad dentro de la funcionalidad Multimedia Viewer de Cisco Webex Meetings, podría permitir a un atacante remoto autenticado omitir las protecciones de seguridad. La vulnerabilidad es debido a la falta de cuadros de diálogo de advertencia de seguridad cuando un host de sala visualiza archivos multimedia compartidos. Un atacante autenticado remoto podría explotar esta vulnerabilidad al usar el rol de host para compartir archivos dentro de la funcionalidad Multimedia sharing y convencer a un antiguo host de la sala para que vea ese archivo. Un cuadro de diálogo de advertencia comúnmente aparece advirtiendo a usuarios antes de  que se muestre el archivo; sin embargo, el host anterior no vería ese cuadro de diálogo de advertencia, y cualquier multimedia compartida se representaría dentro del navegador del usuario. El atacante podría aprovechar este comportamiento para llevar a cabo ataques adicionales mediante la inclusión de archivos maliciosos dentro de la ventana del navegador de un host de sala objetivo."
    }
  ],
  "lastModified": "2026-06-17T03:17:24.393",
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