CVE-2025-66376

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

• https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• https://nvd.nist.gov/vuln/detail/CVE-2025-66376
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
• https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-0850
• 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