{
  "id": "CVE-2024-27443",
  "url": "https://spydr.io/cve/CVE-2024-27443",
  "published": "2024-08-12T15:15:20.283Z",
  "modified": "2026-06-17T07:19:54.627Z",
  "score": 6.1,
  "severity": "medium",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "score_source": "NVD",
  "epss": 0.23632,
  "epss_percentile": 0.97755,
  "exploited": true,
  "kev": {
    "added": "2025-05-19",
    "due": "2025-06-09",
    "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 (XSS) Vulnerability",
    "notes": "https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P46#Security_Fixes ; https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes ; https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes ; https://nvd.nist.gov/vuln/detail/CVE-2024-27443"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "zimbra"
  ],
  "products": [
    "zimbra collaboration"
  ],
  "cwes": [
    "CWE-79"
  ],
  "description": "An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0. A Cross-Site Scripting (XSS) vulnerability exists in the CalendarInvite feature of the Zimbra webmail classic user interface, because of improper input validation in the handling of the calendar header. An attacker can exploit this via an email message containing a crafted calendar header with an embedded XSS payload. When a victim views this message in the Zimbra webmail classic interface, the payload is executed in the context of the victim's session, potentially leading to execution of arbitrary JavaScript code.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 6.1,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.7#Security_Fixes",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P39#Security_Fixes",
      "tags": [
        "Release Notes"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-27443",
      "tags": [
        "US Government Resource"
      ]
    },
    {
      "url": "https://www.welivesecurity.com/en/eset-research/operation-roundpress/",
      "tags": [
        "Press/Media Coverage"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27443",
  "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."
    }
  ]
}