CVE-2026-118669

{
  "etk_id": "ETK-2026-2956",
  "cve_id": "CVE-2026-118669",
  "display_id": "CVE-2026-118669",
  "ghsa_id": "GHSA-7984-qgvg-3j9c",
  "euvd_id": "EUVD-2026-112488",
  "status": "published",
  "anchor_state": "anchored",
  "title": "OAuthlib token-grant client identity authorization bypass",
  "summary": "OAuthlib versions before 4.0.0 can authorize client_credentials and password token requests using a client identity different from the authenticated client. An attacker with valid credentials for a lower-privilege confidential client may obtain tokens with another client's permitted grants or scopes when the deployment's validator authorizes using the client_id argument.",
  "mitigation": "Upgrade OAuthlib to version 4.0.0 or later. Until upgraded, make validators derive grant and scope authorization exclusively from the authenticated request.client identity and reject mismatched client identifiers.",
  "vendor": "pip",
  "product": "pip:oauthlib",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "3.3.1"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "4.0.0"
      ],
      "package_name": "oauthlib",
      "purl": "pkg:pypi/oauthlib"
    }
  ],
  "cwes": [
    863
  ],
  "cvss_score": 8.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 8.785642883333333,
  "t0_at": "2026-10-28T21:09:58.893000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-28T21:09:58.893000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-28T21:09:58.893000+00:00",
      "url": "https://github.com/oauthlib/oauthlib/security/advisories/GHSA-7984-qgvg-3j9c"
    }
  }
}