CVE-2026-96760

{
  "etk_id": "ETK-2026-1579",
  "cve_id": "CVE-2026-96760",
  "display_id": "CVE-2026-96760",
  "ghsa_id": "GHSA-6m87-8wg6-hh8w",
  "euvd_id": "EUVD-2026-88465",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Authlib JSON JWS signature verification bypass",
  "summary": "Authlib versions before 1.9.0 can accept a JSON JWS object without a signature as successfully verified when processed by JsonWebSignature.deserialize_json(). An unauthenticated attacker may bypass authentication or authorization where an application passes untrusted JWS JSON to this method and trusts the returned payload's claims.",
  "mitigation": "Upgrade the authlib package to version 1.9.0. Until upgrading, do not pass untrusted JSON JWS input to JsonWebSignature.deserialize_json() or rely on its returned payload for security decisions.",
  "vendor": "pip",
  "product": "pip:Authlib",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 1.8.0"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "1.9.0"
      ],
      "package_name": "authlib",
      "purl": "pkg:pypi/authlib"
    }
  ],
  "cwes": [
    347
  ],
  "cvss_score": 9.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": 0.0028,
  "epss_percentile": 0.1907,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 14.736954833333334,
  "t0_at": "2026-09-28T19:37:58.973000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-14T15:13:51.963706+00:00",
      "days": 15.816585540578703,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T19:37:58.973000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-10-14T08:57:37+00:00",
      "days": 15.555301238425926,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T19:37:58.973000+00:00",
      "url": "https://github.com/authlib/authlib/security/advisories/GHSA-6v38-4h7w-rj9h"
    },
    "trigger_signal": {
      "at": "2026-09-28T19:37:58.973000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T19:37:58.973000+00:00",
      "url": "https://github.com/authlib/authlib/security/advisories/GHSA-6v38-4h7w-rj9h"
    }
  }
}