Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
Details
CISA date
2026-03-18
Affected versions
Zimbra Collaboration Suite (ZCS)
Summary
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.
Remediation
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Exploit info
No exploit-tagged NVD references in our cache; see the CISA KEV link below.
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