CVE-2026-116672

{
  "etk_id": "ETK-2026-1580",
  "cve_id": "CVE-2026-116672",
  "display_id": "CVE-2026-116672",
  "ghsa_id": "GHSA-c73q-w75p-j82v",
  "euvd_id": "EUVD-2026-111112",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Authorization bypass in Authlib ClientConfigurationEndpoint",
  "summary": "Authlib deployments using the documented RFC 7592 ClientConfigurationEndpoint examples may fail to bind a registration access token to the client registration being requested. An attacker with a valid registration token for one client could access, alter, or remove another client's registration if the deployment follows those examples and the target client can be edited.",
  "mitigation": "Upgrade Authlib to version 1.9.1 or later. Ensure ClientConfigurationEndpoint authorization verifies that the presented registration access token belongs to the target client before permitting registration reads, changes, or deletion.",
  "vendor": "pip",
  "product": "pip:Authlib",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=0.15, <=1.9.0"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "1.9.1"
      ],
      "package_name": "Authlib",
      "purl": "pkg:pypi/Authlib"
    }
  ],
  "cwes": [
    639
  ],
  "cvss_score": 8.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 11.828484433333333,
  "t0_at": "2026-10-27T16:31:48.429000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-14T14:22:06+00:00",
      "days": -13.090074409722222,
      "is_lower_bound": false,
      "measured_at": "2026-10-27T16:31:48.429000+00:00",
      "url": "https://github.com/authlib/authlib/security/advisories/GHSA-c73q-w75p-j82v"
    }
  }
}