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Synacor

2026-02-17 · Severity 8/10 — High · Vulnerability
Incident Summary

CVE-2025-66376: 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.

Sources
https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json https://nvd.nist.gov/vuln/detail/CVE-2025-66376
Details
Records Affected
Unknown
Industry
—
Headquarters
—
Date Reported
2026-02-17
Related Breaches

No related breaches in the last 90 days.