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.

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 Products

References

• https://wiki.zimbra.com/wiki/Security_Center(Release Notes, Vendor Advisory)
• https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes(Release Notes)
• https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes(Release Notes)
• https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy(Product)
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories(Vendor Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376(US Government Resource)

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