CVE-2026-105207

{
  "etk_id": "ETK-2026-563",
  "cve_id": "CVE-2026-105207",
  "display_id": "CVE-2026-105207",
  "ghsa_id": "GHSA-98x8-wvr5-pxqj",
  "euvd_id": "EUVD-2026-92100",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Improper identity-provider link authorization in ZITADEL",
  "summary": "ZITADEL 3.0.0 through 3.4.15 and 4.0.0 through 4.17.2 insufficiently protect external identity-provider linking operations. An unauthenticated attacker who knows a user's login name may attach an identity they control and later access the user's account.",
  "mitigation": "Upgrade ZITADEL to version 4.17.3 or later. Prioritize upgrades for deployments using external identity providers or Login V2 flows.",
  "vendor": "zitadel",
  "product": "zitadel",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 4.17.3"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "4.17.3"
      ],
      "package_name": "zitadel",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, <= 4.19.4"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "zitadel",
      "purl": null
    }
  ],
  "cwes": [
    306
  ],
  "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:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0031,
  "epss_percentile": 0.226,
  "epss_asof": "2026-10-21",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 24.252519583333335,
  "t0_at": "2026-10-04T13:10:02.024000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-06T18:45:47.002358+00:00",
      "days": 2.233159471736111,
      "is_lower_bound": false,
      "measured_at": "2026-10-04T13:10:02.024000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-04T13:10:02.024000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-04T13:10:02.024000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-105207"
    }
  }
}