CVE-2026-49272

{
  "etk_id": "ETK-2026-2766",
  "cve_id": "CVE-2026-49272",
  "display_id": "CVE-2026-49272",
  "ghsa_id": "GHSA-3jp2-3mrg-2vxc",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "OAuthlib device-code grant token validation bypass",
  "summary": "OAuthlib deployments using the RFC 8628 device authorization grant are affected. An attacker who knows an enabled device-flow client ID may obtain a bearer token without a valid device code when the token endpoint accepts the relevant client authentication.",
  "mitigation": "Upgrade the oauthlib package to version 4.0.0. Until upgraded, disable or tightly restrict device authorization grant processing where feasible.",
  "vendor": "pip",
  "product": "pip:oauthlib",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.3.0, < 4.0.0"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "4.0.0"
      ],
      "package_name": "oauthlib",
      "purl": "pkg:pypi/oauthlib"
    }
  ],
  "cwes": null,
  "cvss_score": 8.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 17.4530276,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-10-27T13:30:17+00:00",
      "days": -0.2330538488310185,
      "is_lower_bound": true,
      "measured_at": "2026-10-27T19:05:52.881708+00:00",
      "url": "https://github.com/advisories/GHSA-3jp2-3mrg-2vxc"
    },
    "trigger_signal": {
      "at": "2026-10-27T13:30:17+00:00",
      "days": -0.2330538488310185,
      "is_lower_bound": true,
      "measured_at": "2026-10-27T19:05:52.881708+00:00",
      "url": "https://github.com/advisories/GHSA-3jp2-3mrg-2vxc"
    }
  }
}