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

When

2026-03-18 00:00 UTC · day precision

Where

Global (internet)

Category

cyber_exploit

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.

Sources

• CISA ↗ · first seen 2026-03-18 00:00 UTC

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Correlated events

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