Threat intelligence / Vulnerability
CVE-2025-66376
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.
Vulnerability
TypeVulnerability
External ID—
First seen2026-03-18
Last seen2026-03-18
Confidence
—
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.
Labels
CISA KEV context
Vendor / productSynacor Zimbra Collaboration Suite (ZCS)
Added2026-03-18
Due date2026-04-01
7 recorded
Relationships
2 external