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CVE-2025-66376

Estado: AnalizadaMedia (6.1)⚠ Explotación activa

Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.

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).

CISA KEV — explotada activamente

🎯 Técnicas ATT&CK

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

XSS almacenado mediante @import CSS en correos HTML (CWE-79) permite inyección de scripts en navegador. Vector AV:N/UI:R sin autenticación y explotación activa confirmada (KEV) respaldan T1189. T1059.007 por ejecución de scripts en contexto de aplicación web.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Restrict Web-Based ContentUser TrainingExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or ProgramApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Synacor — Zimbra Collaboration Suite

CWE

Referencias

JSON original (NVD)

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    },
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  "lastModified": "2026-09-30T23:10:00.237",
  "cisaActionDue": "2026-04-01",
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  "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
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}