PT-2026-64286 · Parse Community · Parse Server

Mtrezza · CVE-2026-66009 · Published 2026-07-24 · Updated 2026-07-24

NVD

CVSS v4.0

6.3

Medium

Base vector

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.

Fix

Generation of Error Message Containing Sensitive Information

Weakness Enumeration

CWE-209

Related Identifiers

CVE-2026-66009

Affected Products

Parse Server

References · 3

• https://github.com/parse-community/parse-server/security/advisories/GHSA-2fgh-8j2g-w354 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-66009 · Security Note
• https://vulncheck.com/advisories/parse-server-information-disclosure-via-graphql-error-messages-2 · Note