KEV Entry

CVE-2025-66376

Known Exploited Vulnerability Entry External Catalog

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Entry Details
Confirmed Exploited

CVE-2025-66376

2026-06-01 12:10 UTC

Timestamps

2026-06-01

2026-06-01

Scope

KEVIntel entry: 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... | Affected: Zimbra / Collaboration | CVSS: 7.2 (HIGH) | EPSS: 0.12009 | Used in malware: unknown | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2025-66376', 'url': 'https://www.cve.org/CVERecord?id=CVE-2025-66376'}
  • {'id': 'kevintel', 'url': 'https://kevintel.com/vuln/CVE-2025-66376'}

6dbfa806-400b-4204-83e4-3b4efbb6a0b5

caeb2787-0d58-4236-9039-7c86c3e566f3

2026-06-23 14:03 UTC

2026-06-23 14:03 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report kevintel successful_exploitation 0.70
View details 
{
  "added_date": "2026-06-01T12:10:26.616Z",
  "ahead_of_cisa_kev": {
    "count": 1,
    "unit": "day"
  },
  "cvss_score": 7.2,
  "cvss_severity": "HIGH",
  "epss_percentile": 0.95594,
  "epss_score": 0.12009,
  "feed": "KEVIntel (kevintel.com)",
  "not_yet_in_cisa_kev": false,
  "product": "Collaboration",
  "title": "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...",
  "used_in_malware": "unknown",
  "vendor": "Zimbra"
}
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