VIR Vulnerability Intelligence Relay

CVE-2025-66376

unknown KEV
Published 2026-03-18 · Modified 2026-03-18
CVSS v3
—
CVSS v2
—
VIR risk
1.5

Description

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.

CISA KEV

Vendor
Synacor
Product
Zimbra Collaboration Suite (ZCS)
Due date
2026-04-01

Predictions

Exploit likelihood
99%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: cisa-kev — https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-66376

Exploits

References

Verify integrity in audit chain (admin only). AS-IS.