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Vulnerabilities CVE-2026-66009

CVE-2026-66009

Medium
Open
TLP:CLEAR

Parse Server 9.0.0 Information Disclosure via GraphQL Error Messages

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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.

Details

CVSS Score
6.3
EPSS Score
0.26%

18.1th percentile

CVSS Vector
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
Confidence
90%
Published
Jul 24, 2026
Last Modified
Jul 28, 2026
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