{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "9.0.0"
              },
              {
                "fixed": "9.10.0-alpha.5"
              },
              {
                "introduced": "8.2.2"
              },
              {
                "fixed": "8.6.86"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "532a461d30a6ed4457839f2caf5f30d5abf51a55"
            },
            {
              "fixed": "3fa545f5901a84240ae05505a8688d468122b7a9"
            },
            {
              "introduced": "e3f5ae0be78361daffee9e8bde148906e9b878f9"
            },
            {
              "fixed": "c14da8141b60ebba71ffe709f1d927835ee971f5"
            }
          ],
          "repo": "https://github.com/parse-community/parse-server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-2fgh-8j2g-w354"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-209"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66009.json"
  },
  "details": "Parse Server versions \u003e= 9.0.0 before 9.10.0-alpha.5 and \u003e= 8.2.2 before 8.6.86 return GraphQL validation error messages that name required custom input fields even when public introspection is disabled (graphQLPublicIntrospection: false, the default). A client holding only the public application id — with no user session, master key, or maintenance key — can trigger validation errors to learn the names of required (non-null) custom fields on classes it already references by name, partially defeating the schema-hiding intent of disabling public introspection. No stored data, credentials, optional field names, unreferenced class names, or Cloud Code function names are exposed.",
  "id": "CVE-2026-66009",
  "modified": "2026-08-12T03:51:39.022140982Z",
  "published": "2026-07-24T12:07:56.720Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66009.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-2fgh-8j2g-w354"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66009"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/parse-server-information-disclosure-via-graphql-error-messages-2"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Parse Server 9.0.0 Information Disclosure via GraphQL Error Messages"
}