CVE-2026-106488

{
  "etk_id": "ETK-2026-826",
  "cve_id": "CVE-2026-106488",
  "display_id": "CVE-2026-106488",
  "ghsa_id": "GHSA-826h-28h9-65hg",
  "euvd_id": "EUVD-2026-94007",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Improper authentication in Backstage OIDC identity resolution",
  "summary": "Backstage deployments using the OIDC provider module's email-based identity resolution are affected when their identity provider allows unverified email addresses. An authenticated identity-provider user could be associated with another catalog identity and gain that identity's access permissions.",
  "mitigation": "Upgrade the backstage package to 1.54.6 and plugin-auth-backend-module-oidc-provider to 0.4.20. Until upgrades are complete, require verified email addresses from the identity provider or disable email-based identity resolution.",
  "vendor": "backstage",
  "product": "backstage",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 0.4.20"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "0.4.20"
      ],
      "package_name": "@backstage/plugin-auth-backend-module-oidc-provider",
      "purl": "pkg:npm/@backstage/plugin-auth-backend-module-oidc-provider"
    }
  ],
  "cwes": [
    287
  ],
  "cvss_score": 8.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": 0.0028,
  "epss_percentile": 0.1927,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 19.783849266666667,
  "t0_at": "2026-10-06T20:38:18.045000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-07T01:12:02.751750+00:00",
      "days": 0.19010077256944444,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T20:38:18.045000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-06T20:38:18.045000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T20:38:18.045000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-106488"
    }
  }
}