CVE-2025-66376
SY
Synacor Zimbra Collaboration Suite (ZCS)
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability
What it is
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.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
Description and required action as published by CISA. Full record at NVD.
Other Synacor entries on the list
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- Zimbra Collaboration Suite Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability CVE-2020-7796 · Feb 17, 2026
- Zimbra Collaboration Suite (ZCS) Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability CVE-2025-68645 · Jan 22, 2026
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- Zimbra Collaboration Suite (ZCS) Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability CVE-2019-9621 · Jul 7, 2025