CVE Watch—

CVE-2025-66376

Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability

CVSS

—

Sin CVSS

EPSS

12.0%

p96

KEV

SÍ

18 mar 2026

Exploit Today

0-100

Publicado: — · Última mod.: —

EPSS · 30d

12.0%EPSS · 30 días12.0%

2026-06-302026-07-17

Ficha del catálogo KEV

Producto

Synacor / Zimbra Collaboration Suite (ZCS)

Vulnerabilidad

Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability

Añadido a KEV

18 mar 2026

Remediar antes de

1 abr 2026

Uso conocido en ransomware

Descripción resumida

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability in the Classic UI where attackers could abuse Cascading Style Sheets (CSS) @import directives in email HTML.

Acción requerida

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notas

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-66376

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