Unrated severityCISA KEVOSV Advisory· Published Jan 5, 2026· Updated Mar 19, 2026

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Zimbra/Zm BuildOSV
Range: 10.0.0-GA, 10.0.1, 10.0.13, …
Zimbra/Zimbra Collaboration (ZCS)llm-fuzzy
Range: <10.0.18, <10.1.13

Patches

Vulnerability mechanics

References

wiki.zimbra.com/wiki/Security_Centermitre
wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18mitre
wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13mitre
wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policymitre
wiki.zimbra.com/wiki/Zimbra_Security_Advisoriesmitre

News mentions

23rd March – Threat Intelligence Report
Check Point Research · Mar 23, 2026

cvss	0.000
epss	0.010
exploit	0.000
kev	0.120
patch	0.000
ransomware	0.000