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.
References (6)
Core 6
Core References
US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376
Third Party Advisory
https://wiki.zimbra.com/wiki/Security_Center
Third Party Advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes
Third Party Advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes
Third Party Advisory
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
Third Party Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Scores
CVSS v3
7.2
EPSS
0.1066
EPSS Percentile
93.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
active
Automatable
no
Technical Impact
partial
Details
CISA KEV
2026-03-18
VulnCheck KEV
2026-03-17
ENISA EUVD
EUVD-2026-0850
CWE
CWE-79
Status
published
Products (3)
synacor/zimbra_collaboration_suite
10.0.0 - 10.0.18
Zimbra/Collaboration
10.0 - 10.0.18
Zimbra/Collaboration
10.1 - 10.1.13
Published
Jan 05, 2026
KEV Added
Mar 18, 2026
Tracked Since
Feb 18, 2026