{
  "id": "CVE-2025-27915",
  "url": "https://spydr.io/cve/CVE-2025-27915",
  "published": "2025-03-12T15:15:39.900Z",
  "modified": "2026-06-17T09:04:22.957Z",
  "score": 5.4,
  "severity": "medium",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
  "score_source": "CISA ADP",
  "epss": 0.04064,
  "epss_percentile": 0.90366,
  "exploited": true,
  "kev": {
    "added": "2025-10-07",
    "due": "2025-10-28",
    "action": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
    "ransomware": "Unknown",
    "name": "Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability",
    "notes": "https://wiki.zimbra.com/wiki/Security_Center ; https://nvd.nist.gov/vuln/detail/CVE-2025-27915"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "synacor"
  ],
  "products": [
    "synacor zimbra collaboration suite"
  ],
  "cwes": [
    "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.",
  "status": "Analyzed",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 5.4,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://wiki.zimbra.com/wiki/Security_Center",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.13#Security_Fixes",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.5#Security_Fixes",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P44#Security_Fixes",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://strikeready.com/blog/0day-ics-attack-in-the-wild/",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-27915",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2025-27915",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}