{
  "cveId": "CVE-2018-8366",
  "url": "https://patchblox.com/security/cve/CVE-2018-8366",
  "summary": "CVE-2018-8366 is fixed in 2 products on 1 platform, first by KB4457128, released September 11, 2018. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.",
  "title": "Microsoft Edge Information Disclosure Vulnerability",
  "description": "\u003Cp\u003EAn information disclosure vulnerability exists when the Microsoft Edge Fetch API incorrectly handles a filtered response type. An attacker could use the vulnerability to read the URL of a cross-origin request. Websites that that do not securely populate the URL with confidential information could allow information to be disclosed to an attacker.\u003C/p\u003E\n\u003Cp\u003ETo exploit the vulnerability, in a web-based attack scenario, an attacker could host a website in an attempt to exploit the vulnerability. In addition, the user must be logged on to a website that does not securely populate URLs with confidential information. However, in all cases an attacker would have no way to force a user to view the attacker-controlled content. Instead, an attacker would have to convince the user to take action. For example, an attacker could trick a user into clicking a link that takes them to the attacker\u0027s site.\u003C/p\u003E\n\u003Cp\u003EThe update addresses the vulnerability by changing how the Fetch API in Microsoft Edge handles specific filtered response types.\u003C/p\u003E",
  "published": "2018-09-11T07:00:00Z",
  "severity": "Important",
  "cvss": 4.3,
  "epss": 0.05046,
  "epssPercentile": 0.92334,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation More Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8366",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems",
      "fixedVersion": "17134.285",
      "fix": "KB4457128",
      "url": "https://patchblox.com/security/fix/microsoft/kb4457128",
      "released": "2018-09-11T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems",
      "fixedVersion": "17134.285",
      "fix": "KB4457128",
      "url": "https://patchblox.com/security/fix/microsoft/kb4457128",
      "released": "2018-09-11T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T06:34:28Z"
}