Vulnerabilities CVE-2025-66376

CVE-2025-66376

Medium

Open

KEV

TLP:CLEAR

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

NVD CVE.org

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Description

Synacor — Zimbra Collaboration Suite (ZCS) — 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.

Details

EPSS Score ⓘ: 21.97%

97.4th percentile
Confidence: 100%
CISA KEV
Date Added: Mar 18, 2026
Patch Due: Apr 1, 2026
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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