ETK-2026-3377Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-3377",
  "cve_id": null,
  "display_id": "ETK-2026-3377",
  "ghsa_id": "GHSA-gp2m-377p-m4j3",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Improper redirect URI validation in Authlib",
  "summary": "Authlib versions before 1.9.3 can accept unsafe redirect URIs when registering OIDC web clients. An attacker able to register a client may obtain JavaScript execution in the authorization server's origin after a user authorizes that client, when implicit flow with form-post responses is enabled. Dynamic client registration and the affected OIDC flow must be available for exploitation.",
  "mitigation": "Upgrade Authlib to version 1.9.3 or later. Until upgraded, disable or restrict dynamic client registration, reject non-HTTP(S) redirect URIs, and disable implicit flow or form-post responses where possible.",
  "vendor": "pip",
  "product": "pip:Authlib",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 1.9.2"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "1.9.3"
      ],
      "package_name": "Authlib",
      "purl": "pkg:pypi/Authlib"
    }
  ],
  "cwes": [
    79
  ],
  "cvss_score": 7.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/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": 31.16298778333333,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-11-03T09:12:20+00:00",
      "days": -0.3249964331712963,
      "is_lower_bound": true,
      "measured_at": "2026-11-03T17:00:19.728986+00:00",
      "url": "https://github.com/authlib/authlib/security/advisories/GHSA-gp2m-377p-m4j3"
    },
    "trigger_signal": {
      "at": "2026-11-03T09:12:20+00:00",
      "days": -0.3249964331712963,
      "is_lower_bound": true,
      "measured_at": "2026-11-03T17:00:19.728986+00:00",
      "url": "https://github.com/authlib/authlib/security/advisories/GHSA-gp2m-377p-m4j3"
    }
  }
}