{
    "id": "CVE-2025-66376",
    "published": "2026-01-05 15:15:44",
    "last_modified": "2026-06-17 09:56:44",
    "cvss_score": "7.2",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
    "cwe": "CWE-79",
    "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.",
    "epss_score": "0.19559",
    "epss_percentile": "0.97296",
    "kev": 1,
    "kev_due": "2026-04-01",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:40:35",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2026-04-01."
    },
    "products": [
        {
            "vendor": "synacor",
            "product": "zimbra_collaboration_suite"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2025-66376",
        "date_added": "2026-03-18",
        "due_date": "2026-04-01",
        "vendor": "Synacor",
        "product": "Zimbra Collaboration Suite (ZCS)",
        "name": "Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "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",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-66376"
    ]
}