Vulnerability Description
Parse Server versions >= 9.0.0 before 9.10.0-alpha.5 and >= 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.
Related Weaknesses (CWE)
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-2fgh-8j
- https://www.vulncheck.com/advisories/parse-server-information-disclosure-via-gra
FAQ
What is CVE-2026-66009?
CVE-2026-66009 is a documented vulnerability. Parse Server versions >= 9.0.0 before 9.10.0-alpha.5 and >= 8.2.2 before 8.6.86 return GraphQL validation error messages that name required custom input fields even when public introspection is disabl...
How severe is CVE-2026-66009?
CVSS scoring is not yet available for CVE-2026-66009. Check NVD for updates.
Is there a patch for CVE-2026-66009?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.