CVE-2026-102870

{
  "etk_id": "ETK-2026-1510",
  "cve_id": "CVE-2026-102870",
  "display_id": "CVE-2026-102870",
  "ghsa_id": "GHSA-g27p-qf6j-c96c",
  "euvd_id": "EUVD-2026-100325",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Code injection in Blazor WebAssembly debugger",
  "summary": "Microsoft.AspNetCore.Components.WebAssembly.Server contains a code-injection flaw in its Blazor WebAssembly debugging support. An attacker may cause code to run on a developer's machine if the developer debugs an application using an affected release and evaluates an expression involving attacker-controlled data.",
  "mitigation": "Upgrade Microsoft.AspNetCore.Components.WebAssembly.Server to 10.0.13 or 11.0.0-rc.2.26478.115, as appropriate for the .NET release in use. Restart the development environment and debugger after updating.",
  "vendor": "nuget",
  "product": "nuget:Microsoft.AspNetCore.Components.WebAssembly.Server",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 10.0.0, <= 10.0.12"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "10.0.13"
      ],
      "package_name": "Microsoft.AspNetCore.Components.WebAssembly.Server",
      "purl": "pkg:nuget/Microsoft.AspNetCore.Components.WebAssembly.Server"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 11.0.0-preview.1, <= 11.0.0-rc.1"
      ],
      "ecosystem": "nuget",
      "fixed_versions": [
        "11.0.0-rc.2.26478.115"
      ],
      "package_name": "Microsoft.AspNetCore.Components.WebAssembly.Server",
      "purl": "pkg:nuget/Microsoft.AspNetCore.Components.WebAssembly.Server"
    }
  ],
  "cwes": null,
  "cvss_score": 8.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "epss_score": 0.0078,
  "epss_percentile": 0.5511,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 17.793350633333333,
  "t0_at": "2026-10-13T19:01:30.882000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-13T19:01:30.882000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-13T19:01:30.882000+00:00",
      "url": "https://github.com/advisories/GHSA-g27p-qf6j-c96c"
    }
  }
}