{
  "fix": "Microsoft Edge WebView2 Runtime 154.0.4258.62",
  "url": "https://patchblox.com/security/fix/windows-app/microsoft.edgewebview2runtime-154.0.4258.62",
  "summary": "Microsoft Edge WebView2 Runtime 154.0.4258.62, released October 5, 2026, fixes 13 CVEs in Microsoft Edge WebView2 Runtime. One of them is being exploited (CVE-2026-96951); 1 on CISA KEV. Patch Radar priority: Patch now. The latest Microsoft Edge WebView2 Runtime is 157.0.4341.42, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Microsoft Edge WebView2 Runtime 154.0.4258.62",
  "released": "2026-10-05T00:00:00Z",
  "priority": "Patch now",
  "priorityTier": 1,
  "priorityReason": "Closes CVE-2026-96951, exploited (CISA KEV)",
  "supported": true,
  "cveCount": 13,
  "exploitedCveCount": 1,
  "kevCveCount": 1,
  "ransomwareCveCount": 0,
  "maxEpss": 0.09813,
  "maxCvss": 9.6,
  "appliesTo": [
    {
      "product": "Microsoft Edge WebView2 Runtime",
      "productUrl": "https://patchblox.com/security/product/windows-app/microsoft-edge-webview2-runtime",
      "fixedVersion": "154.0.4258.62",
      "latestVersion": "157.0.4341.42",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Microsoft Edge WebView2 Runtime",
    "latestVersion": "157.0.4341.42",
    "productUrl": "https://patchblox.com/security/product/windows-app/microsoft-edge-webview2-runtime"
  },
  "cves": [
    {
      "cveId": "CVE-2026-96951",
      "url": "https://patchblox.com/security/cve/CVE-2026-96951",
      "title": "Windows Shell Security Feature Bypass Vulnerability",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.09813,
      "kev": true,
      "ransomware": false,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103628",
      "url": "https://patchblox.com/security/cve/CVE-2026-103628",
      "title": "Chromium CVE-2026-103628: Out of bounds write",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.6,
      "epss": 0.00378,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103626",
      "url": "https://patchblox.com/security/cve/CVE-2026-103626",
      "title": "Chromium CVE-2026-103626: Incorrect authorization",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.6,
      "epss": 0.00326,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103630",
      "url": "https://patchblox.com/security/cve/CVE-2026-103630",
      "title": "Chromium CVE-2026-103630: Use after free",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.6,
      "epss": 0.00325,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-88077",
      "url": "https://patchblox.com/security/cve/CVE-2026-88077",
      "title": "Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00625,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103631",
      "url": "https://patchblox.com/security/cve/CVE-2026-103631",
      "title": "Chromium CVE-2026-103631: Buffer overflow",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.0046,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103625",
      "url": "https://patchblox.com/security/cve/CVE-2026-103625",
      "title": "Chromium CVE-2026-103625: Type confusion",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00324,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103622",
      "url": "https://patchblox.com/security/cve/CVE-2026-103622",
      "title": "Chromium CVE-2026-103622: Use after free",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00309,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103623",
      "url": "https://patchblox.com/security/cve/CVE-2026-103623",
      "title": "Chromium CVE-2026-103623: Use after free",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00303,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103624",
      "url": "https://patchblox.com/security/cve/CVE-2026-103624",
      "title": "Chromium CVE-2026-103624: Use after free",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.3,
      "epss": 0.00284,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103629",
      "url": "https://patchblox.com/security/cve/CVE-2026-103629",
      "title": "Chromium CVE-2026-103629: Integer overflow",
      "priority": "High",
      "severity": "medium",
      "cvss": 9.6,
      "epss": 0.00202,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103627",
      "url": "https://patchblox.com/security/cve/CVE-2026-103627",
      "title": "Chromium CVE-2026-103627: Information leak",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 6.5,
      "epss": 0.00247,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-103621",
      "url": "https://patchblox.com/security/cve/CVE-2026-103621",
      "title": "Chromium CVE-2026-103621: Integer overflow",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00202,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-11T13:47:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}