{"id":"CVE-2026-66009","summary":"Parse Server 9.0.0 Information Disclosure via GraphQL Error Messages","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.","aliases":["GHSA-2fgh-8j2g-w354"],"modified":"2026-08-12T03:51:39.022140982Z","published":"2026-07-24T12:07:56.720Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66009.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-209"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/parse-community/parse-server","events":[{"introduced":"532a461d30a6ed4457839f2caf5f30d5abf51a55"},{"fixed":"3fa545f5901a84240ae05505a8688d468122b7a9"},{"introduced":"e3f5ae0be78361daffee9e8bde148906e9b878f9"},{"fixed":"c14da8141b60ebba71ffe709f1d927835ee971f5"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"9.0.0"},{"fixed":"9.10.0-alpha.5"},{"introduced":"8.2.2"},{"fixed":"8.6.86"}]}}],"versions":["9.9.0","8.6.85","9.10.0-alpha.4","8.6.84","9.10.0-alpha.3","9.10.0-alpha.2","8.6.83","9.10.0-alpha.1","9.9.1-alpha.13","8.6.82","9.9.1-alpha.12","8.6.81","9.9.1-alpha.11","8.6.80","9.9.1-alpha.10","9.9.1-alpha.9","9.9.1-alpha.8","9.9.1-alpha.7","9.9.1-alpha.6","8.6.79","9.9.1-alpha.5","9.9.1-alpha.4","8.6.78","9.9.1-alpha.3","9.9.1-alpha.2","8.6.77","9.9.1-alpha.1","8.6.76","9.8.0","8.6.75","9.7.0","8.6.74","8.6.73","8.6.72","8.6.71","8.6.70","9.6.1","8.6.69","8.6.68","8.6.67","8.6.66","8.6.65","8.6.64","8.6.63","8.6.62","9.6.0","9.5.1","8.6.61","8.6.60","8.6.59","8.6.58","8.6.57","8.6.56","8.6.55","8.6.54","8.6.53","8.6.52","8.6.51","8.6.50","8.6.49","8.6.48","8.6.47","8.6.46","8.6.45","8.6.44","8.6.43","8.6.42","8.6.41","8.6.40","8.6.39","8.6.38","8.6.37","8.6.36","8.6.35","8.6.34","8.6.33","8.6.32","8.6.31","8.6.30","8.6.29","8.6.28","8.6.27","8.6.26","8.6.25","8.6.24","8.6.23","8.6.22","8.6.21","8.6.20","8.6.19","8.6.18","8.6.17","8.6.16","8.6.15","8.6.14","8.6.13","9.5.0","8.6.12","8.6.11","9.4.1","8.6.10","8.6.9","8.6.8","8.6.7","8.6.6","8.6.5","8.6.4","9.4.0","8.6.3","9.3.1","9.3.0","8.6.2","9.2.0","9.1.1","9.1.0","8.6.1","9.0.0","8.6.0","8.5.0","8.4.0","8.3.0","8.2.5","8.2.4","8.2.3","8.2.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66009.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}]}