CVE-2026-66009 | Parse Server versions >= 9.0.0 before 9.10.0-alpha.5 and >= … | CVSS 6.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-66009
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-23 19:22 UTC
Published: 2026-07-24 12:07 UTC
Last updated: 2026-07-24 12:07 UTC
Primary CWE: CWE-209
Generation of Error Message Containing Sensitive Information
Vendor / Product: parse-community / parse-server
Sources: cve.org · NVD

Severity & Metrics

6.3 MEDIUM CVSS 4.0

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

Affected products (2)

Vendor	Product	Platform	Versions
parse-community	parse-server	—	9.0.0 < 9.10.0-alpha.5, 9.10.0-alpha.5
parse-community	parse-server	—	8.2.2 < 8.6.86, 8.6.86

Weakness (CWE)

CWE	Source	Description
CWE-209	cna	Generation of Error Message Containing Sensitive Information

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.3	MEDIUM	4.0	cna	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

References (2)

GitHub Security Advisory (GHSA-2fgh-8j2g-w354) https://github.com/parse-community/parse-server/security/advisories/GHSA-2fgh-8j2g-w354
VulnCheck Advisory: Parse Server 9.0.0 Information Disclosure via GraphQL Error Messages https://www.vulncheck.com/advisories/parse-server-information-disclosure-via-graphql-error-messages-2