CVE-2025-66376

Published: Jan 5, 2026Modified: Jun 17, 2026CISA KEV

6.1

Vector

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

Exploitability: 2.8 / Impact: 2.7

Source: NVD

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.

Affected (2)

Products: Synacor: Zimbra Collaboration Suite

Synacor

1 product

Zimbra Collaboration Suite

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Synacor Zimbra Collaboration Suite	From 10.0.0 to 10.0.18
Synacor Zimbra Collaboration Suite	From 10.1.0 to 10.1.13

Related CWEs

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (6)

https://wiki.zimbra.com/wiki/Security_Center

Source: cve@mitre.org

Release NotesVendor Advisory

https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes

Source: cve@mitre.org

Release Notes

https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes

Source: cve@mitre.org

Release Notes

https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy

Source: cve@mitre.org

Product

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

Source: cve@mitre.org

Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

Timeline

No history available yet.