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CVE-2025-66376

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...

Basic Information

CVE State
PUBLISHED
Reserved Date
November 28, 2025
Published Date
January 05, 2026
Last Updated
March 19, 2026
Vendor
Zimbra
Product
Collaboration
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.
Tags
cisa

CVSS Scores

CVSS v3.1

7.2 - HIGH

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

SSVC Information

Exploitation
active
Technical Impact
partial

Exploit Status

Exploited in the Wild
Yes (2026-06-01 12:10:26 UTC) Source

References

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories https://wiki.zimbra.com/wiki/Security_Center https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes

Known Exploited Vulnerability Information

Source Added Date
CVE 2026-06-01 12:10:26 UTC

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Added to KEVIntel