CVE-2025-66376

HIGHCISA KEV

7.2

Description

Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.

CVE Details

CVSS v3.1 Score7.2

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published1/5/2026

Last Modified3/18/2026

Sourcekev

Honeypot Sightings0

CISA KEV

VendorSynacor

ProductZimbra Collaboration Suite (ZCS)

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

KEV Date Added2026-03-18

Remediation Due Date2026-04-01

Ransomware UseUnknown

Affected Products

synacor:zimbra_collaboration_suite

Weaknesses (CWE)

CWE-79

References

https://wiki.zimbra.com/wiki/Security_Center(cve@mitre.org)

https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes(cve@mitre.org)

https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes(cve@mitre.org)

https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy(cve@mitre.org)

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories(cve@mitre.org)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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