CVE Watch7 oct 2026

CVE-2025-66376

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

CVSS

7.2

Alto

EPSS

20.2%

p97

KEV

SÍ

18 mar 2026

Exploit Today

0-100

Publicado: 5 ene 2026 · Última mod.: 7 oct 2026 · CWE-79

EPSS · 30d

17.3%EPSS · 30 días20.2%

2026-09-172026-10-15

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

Descripción técnica

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.

Referencias oficiales

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