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CVE-2025-66376· synacor / zimbra collaboration suite (zcs)· CWE-79
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
Exploited in the wild. Listed by CISA on 2026-03-18; known to be used by ransomware.
20.2%likelihood of exploitation, next 30 days
98%of all CVEs are less likely
Nonecheck to confirm it
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.
No ready check is stored for this CVE. Confirm it by hand from the references.
References
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