Vaultwarden: SSO Email Auto-Link Can Bind an Existing Local Account to an Attacker-Controlled IdP Identity

{
  "id": "59c422716a0559ce937afba41c9325cf6e0cf8feaa2fc76a4f98c145823d649d",
  "url": "https://osv.dev/vulnerability/CVE-2026-47164",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Vaultwarden: SSO Email Auto-Link Can Bind an Existing Local Account to an Attacker-Controlled IdP Identity",
    "summary": "Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.36.0, Vaultwarden's SSO login flow checked the IdP email_verified claim only for new-user creation and not when SSO_SIGNUPS_MATCH_EMAIL=true linked an IdP identity to an existing local account, allowing an attacker-controlled IdP identity asserting a victim email address to bind to and authenticate as that account. This issue is fixed in version 1.36.0.",
    "evidence": "osv:CVE-2026-47164",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-47164",
      "aliases": [
        "CVE-2026-47164",
        "GHSA-6x5c-84vm-5j56"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dani-garcia/vaultwarden",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f21a3adae2fbb8582b60b121783c597fe6895ff4"
                },
                {
                  "fixed": "d297e274a35dccd0f5d935e9d5934e0f7e9c0a87"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.36.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d297e274a35dccd0f5d935e9d5934e0f7e9c0a87"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f21a3adae2fbb8582b60b121783c597fe6895ff4"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.36.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.35.8",
            "1.35.7",
            "1.35.6",
            "1.35.5",
            "1.35.4",
            "1.35.3",
            "1.35.2",
            "1.35.1",
            "1.35.0",
            "1.34.3",
            "1.34.2",
            "1.34.1",
            "1.34.0",
            "1.33.2",
            "1.33.1",
            "1.33.0",
            "1.32.7",
            "1.32.6",
            "1.32.5",
            "1.32.4",
            "1.32.3",
            "1.32.2",
            "1.32.1",
            "1.32.0",
            "1.31.0",
            "1.30.5",
            "1.30.4",
            "1.30.3",
            "1.30.2",
            "1.30.1",
            "1.30.0",
            "1.29.2",
            "1.29.1",
            "1.29.0",
            "1.28.1",
            "1.28.0",
            "1.27.0",
            "1.26.0",
            "1.25.2",
            "1.25.1",
            "1.25.0",
            "1.24.0",
            "1.23.1",
            "1.23.0",
            "1.22.2",
            "1.22.1",
            "1.22.0",
            "1.21.0",
            "1.20.0",
            "1.19.0",
            "1.18.0",
            "1.17.0",
            "1.16.3",
            "1.16.2",
            "1.16.1",
            "1.16.0",
            "1.15.1",
            "1.15.0",
            "1.14.2",
            "1.14.1",
            "1.14",
            "1.13.1",
            "1.13.0",
            "1.12.0",
            "1.11.0",
            "1.10.0",
            "1.9.1",
            "1.9.0",
            "1.8.0",
            "1.7.0",
            "1.6.1",
            "1.6.0",
            "1.5.0",
            "1.4.0",
            "1.3.0",
            "1.2.0",
            "1.1.0",
            "1.0.0",
            "0.13.0",
            "0.12.0",
            "0.11.0",
            "0.10.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47164.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.696865325Z",
      "provider": "osv",
      "references": [
        "https://github.com/dani-garcia/vaultwarden/releases/tag/1.36.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47164.json",
        "https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-6x5c-84vm-5j56",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-47164",
        "https://github.com/dani-garcia/vaultwarden/commit/d297e274a35dccd0f5d935e9d5934e0f7e9c0a87",
        "https://github.com/dani-garcia/vaultwarden/pull/7163"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47164.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-47164",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503060,
  "published_at": "2026-07-15T15:03:22.8+00:00"
}