CVE-2025-66376
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
6.1
CVSS 3.1
19.6 %
EPSS (current)
2026-03-18
KEV addition
No
Ransomware
Timeline
Publication, first public exploit and KEV addition on a day axis.
Key facts
Vendor / product: Synacor / Zimbra Collaboration Suite (ZCS)
Published: 2026-01-05 · Due (CISA): 2026-04-01
CWE: CWE-79 · EU list: no
Exploit references (metadata only)
No public exploit references recorded.