{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.31.0"
              },
              {
                "fixed": "1.42.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "07ba4d430c1f6f6641e5cf477ea2ca0d5327343d"
            },
            {
              "fixed": "b560d17a4da4c25da95e3c73af4485d18ab7c224"
            },
            {
              "fixed": "3a8f4a6ef2a00fec105d802c7dd3fbb520a07a3d"
            }
          ],
          "repo": "https://github.com/logto-io/logto",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-6g9q-qrx7-3jxf"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63203.json"
  },
  "details": "Logto is the modern, open-source auth infrastructure for SaaS and AI apps. From 1.31.0 until 1.42.0, the Account API handlers in packages/core/src/routes/account/third-party-tokens.ts allow a caller holding a same-user access token with only the openid scope to retrieve stored social or enterprise SSO provider access tokens through GET /api/my-account/identities/{target}/access-token or GET /api/my-account/sso-identities/{connectorId}/access-token. The handlers authenticate the user but do not require the identities scope that protects neighboring identity-detail operations, bypassing the intended Account API consent boundary. Exploitation requires federated token-set storage to be enabled and the affected user to have authenticated through a supported connector. A low-trust application can use the disclosed provider token against upstream APIs within that token's granted scopes. This issue is fixed in version 1.42.0.",
  "id": "CVE-2026-63203",
  "modified": "2026-09-26T03:30:32.318196778Z",
  "published": "2026-09-24T15:18:32.273Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/logto-io/logto/releases/tag/v1.42.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63203.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/logto-io/logto/security/advisories/GHSA-6g9q-qrx7-3jxf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63203"
    },
    {
      "type": "FIX",
      "url": "https://github.com/logto-io/logto/commit/b560d17a4da4c25da95e3c73af4485d18ab7c224"
    },
    {
      "type": "FIX",
      "url": "https://github.com/logto-io/logto/pull/9116"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Logto: Account API can disclose stored third-party provider tokens without the identities scope"
}