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CVE-2025-66376 - Synacor Zimbra Collaboration Suite (ZCS)

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.

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AI Vulnerability ContextCISA KEVSynacor

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CISA KEVyesWhether CISA lists this as exploited.
Techniques0AI attack methods connected to this vulnerability.
Case studies0Examples where this vulnerability is mentioned.

Vulnerability status

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CISA KEV
CVE ID
CVE-2025-66376
Vendor/project
Synacor
Product
Zimbra Collaboration Suite (ZCS)
Vulnerability name
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
Date added
2026-03-18
Due date
2026-04-01
Known ransomware campaign use
Unknown
CWE-79

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