CVE-2025-66376CISA KEV: Actively Exploited

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

Published Mar 18, 2026·Updated Mar 18, 2026

Description

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.

References

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