cve detail

CVE-2025-66376

naam

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

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.

KEV

bekend misbruikt

EPSS

9,1%

percentiel

93%

vendor

Synacor

product

Zimbra Collaboration Suite (ZCS)

toegevoegd aan KEV

18 mrt 2026

due date

01 apr 2026

ransomware

Unknown

CWE

CWE-79

EPSS datum

12 mei 2026

aanbevolen actie

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

notities

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