CVE-2026-105215

{
  "etk_id": "ETK-2026-561",
  "cve_id": "CVE-2026-105215",
  "display_id": "CVE-2026-105215",
  "ghsa_id": "GHSA-639g-x9rp-hw3x",
  "euvd_id": "EUVD-2026-92108",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Authentication bypass in ZITADEL Login V1",
  "summary": "ZITADEL versions before 3.4.14 and 4.x versions before 4.16.2 are affected in the hosted Login V1 interface. An unauthenticated attacker may cause an account to be associated with a target's external identity and obtain access after the target later signs in through an external identity provider; exposure requires the affected external-account registration flow to be reachable.",
  "mitigation": "Upgrade ZITADEL to 3.4.14 or 4.16.2, as appropriate for the deployed release line. Until upgraded, restrict access to the hosted Login V1 external-account registration flow where operationally possible.",
  "vendor": "zitadel",
  "product": "zitadel",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 4.16.2"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "4.16.2"
      ],
      "package_name": "zitadel",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 3.4.14"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "3.4.14"
      ],
      "package_name": "zitadel",
      "purl": null
    }
  ],
  "cwes": [
    290
  ],
  "cvss_score": 9.3,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
  "epss_score": 0.0034,
  "epss_percentile": 0.2593,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 43.89689203333333,
  "t0_at": "2026-10-04T13:10:07.389000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-04T13:10:07.389000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-04T13:10:07.389000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-105215"
    }
  }
}