{
    "id": "CVE-2025-27915",
    "published": "2025-03-12 15:15:39",
    "last_modified": "2026-06-17 09:04:22",
    "cvss_score": "5.4",
    "cvss_severity": "MEDIUM",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
    "cwe": "CWE-79",
    "description": "An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0 and 10.1. A stored cross-site scripting (XSS) vulnerability exists in the Classic Web Client due to insufficient sanitization of HTML content in ICS files. When a user views an e-mail message containing a malicious ICS entry, its embedded JavaScript executes via an ontoggle event inside a <details> tag. This allows an attacker to run arbitrary JavaScript within the victim's session, potentially leading to unauthorized actions such as setting e-mail filters to redirect messages to an attacker-controlled address. As a result, an attacker can perform unauthorized actions on the victim's account, including e-mail redirection and data exfiltration.",
    "epss_score": "0.03986",
    "epss_percentile": "0.90145",
    "kev": 1,
    "kev_due": "2025-10-28",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:37:22",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2025-10-28."
    },
    "products": [
        {
            "vendor": "synacor",
            "product": "zimbra_collaboration_suite"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2025-27915",
        "date_added": "2025-10-07",
        "due_date": "2025-10-28",
        "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/10.0.13#Security_Fixes",
        "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.5#Security_Fixes",
        "https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P44#Security_Fixes",
        "https://strikeready.com/blog/0day-ics-attack-in-the-wild/",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-27915"
    ]
}