{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "3.0.0"
              },
              {
                "fixed": "3.4.15"
              },
              {
                "introduced": "4.0.0"
              },
              {
                "fixed": "4.17.3"
              }
            ],
            "source": "DESCRIPTION"
          },
          "events": [
            {
              "introduced": "573c96d6af6aa8778efd9bff59f9bc0dab94c495"
            },
            {
              "fixed": "d81ab1cf4e35f7119870416aaac4e4204a337fc3"
            },
            {
              "introduced": "c86c60bab86b64b44755d2776703939c01686055"
            },
            {
              "fixed": "41b11149c6997eddd7e38390912e12ff5f918a73"
            }
          ],
          "repo": "https://github.com/zitadel/zitadel",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g8gj-gq47-xgf4"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-306"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105207.json"
  },
  "details": "ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permission, including on identify-only Login V2 sessions and via the User Service V2 AddIDPLink endpoint. An unauthenticated attacker knowing a victim's login name can bind their own external IdP identity to the victim's account and then sign in as the victim.",
  "id": "CVE-2026-105207",
  "modified": "2026-10-06T02:30:28.889659652Z",
  "published": "2026-10-04T13:10:02.024Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105207.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-g8gj-gq47-xgf4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105207"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/zitadel-before-4.17.3-account-takeover-via-external-idp-linking"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "ZITADEL before 4.17.3 Account Takeover via External IdP Linking"
}