{"cve":"CVE-2025-66376","nvd":{"published":"2026-01-05T15:15:44.903","modified":"2026-10-07T10:10:00.213","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://wiki.zimbra.com/wiki/Security_Center","https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_Fixes","https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_Fixes","https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy","https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories"],"products":["synacor:zimbra_collaboration_suite"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2025-66376","score":0.20227,"percentile":0.97446,"date":"2026-10-25"},"kev":{"cve":"CVE-2025-66376","date_added":"2026-03-18","due_date":"2026-04-01","vendor":"Synacor","product":"Zimbra Collaboration Suite (ZCS)","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}