CVE-2026-66009
Parse Server 9.0.0 Information Disclosure via GraphQL Error Messages
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.
INFO
Published Date :
July 24, 2026, 1:18 p.m.
Last Modified :
Oct. 24, 2026, 1:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-66009
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Parse Server to version 8.6.86 or 9.10.0-alpha.5.
- Apply vendor-supplied patches if available.
- Review GraphQL schema for sensitive information.
- Limit public access to sensitive GraphQL endpoints.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-66009.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-66009 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-66009
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-66009 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-66009 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Added Translation Title: parse-server de parse-community, Description: Las versiones de Parse Server iguales o superiores a 9.0.0 anteriores a 9.10.0-alpha.5 e iguales o superiores a 8.2.2 anteriores a 8.6.86 devuelven mensajes de error de validación de GraphQL que nombran campos de entrada personalizados obligatorios incluso cuando la introspección pública está deshabilitada (graphQLPublicIntrospection: false, el valor predeterminado). Un cliente que posee solo el ID de aplicación público - sin sesión de usuario, clave maestra o clave de mantenimiento - puede desencadenar errores de validación para conocer los nombres de los campos personalizados obligatorios (no nulos) en clases que ya referencia por nombre, lo que anula parcialmente la intención de ocultar el esquema al deshabilitar la introspección pública. No se exponen datos almacenados, credenciales, nombres de campos opcionales, nombres de clases no referenciadas o nombres de funciones de Cloud Code. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 25, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-66009', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-25T00:52:12.374484Z'} -
New CVE Received by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'parse-community', 'product': 'parse-server', 'versions': [{'status': 'affected', 'version': '9.0.0', 'lessThan': '9.10.0-alpha.5', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '9.10.0-alpha.5', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/parse-server', 'defaultStatus': 'unaffected'}, {'vendor': 'parse-community', 'product': 'parse-server', 'versions': [{'status': 'affected', 'version': '8.2.2', 'lessThan': '8.6.86', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '8.6.86', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/parse-server', 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 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 Added CWE CWE-209 Added Reference https://github.com/parse-community/parse-server/security/advisories/GHSA-2fgh-8j2g-w354 Added Reference https://www.vulncheck.com/advisories/parse-server-information-disclosure-via-graphql-error-messages-2