CVE-2026-66009

published 2026-07-24

CVE-2026-66009: 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…

Priority P3 41 medium 6.3 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 E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU X R X V X RE X U X

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
parse-community	parse-server	>= 8.2.2 < 8.6.86	8.6.86
parse-community	parse-server	>= 9.0.0 < 9.10.0-alpha.5	9.10.0-alpha.5

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CWE-209