cve-2025-27915

{
  "cvss": 0.0,
  "datePublished": "2025-10-07",
  "dateUpdated": "2025-10-07",
  "description": "Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that 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 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.",
  "dueDate": "2025-10-28",
  "id": "CVE-2025-27915",
  "kev_catalogs": [
    "cisa"
  ],
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "https://wiki.zimbra.com/wiki/Security_Center ; https://nvd.nist.gov/vuln/detail/CVE-2025-27915",
  "product": "Zimbra Collaboration Suite (ZCS)",
  "requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
  "severity": "HIGH",
  "source": "cisa_known_exploited",
  "title": "Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability",
  "vendor": "Synacor"
}