Executive Summary

CVE-2026-47248 is a security vulnerability in Parse Server's GraphQL endpoint where "Did you mean" validation suggestions in error messages unintentionally exposed internal schema metadata to unauthenticated users.

An attacker who only knows the public application ID can send malformed GraphQL queries repeatedly to reconstruct sensitive schema details such as class names, field names, argument names, mutation names, and input-object fields.

This issue bypasses existing schema-hiding controls and was patched by suppressing these schema-related suggestions in error messages starting from Parse Server versions 8.6.78 and 9.9.1-alpha.2.

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Impact Analysis

This vulnerability allows unauthenticated attackers to gather detailed information about the internal GraphQL schema of a Parse Server application.

While it does not directly expose user data, authentication credentials, or affect data integrity or availability, the disclosed schema metadata can aid attackers in reconnaissance and planning further attacks, such as probing for authorization weaknesses.

The attack is network-based, requires no privileges or user interaction, and has a moderate severity with a CVSS score of 6.9.

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Detection Guidance

This vulnerability can be detected by monitoring GraphQL endpoint responses for validation error messages that include "Did you mean" suggestions exposing schema metadata to unauthenticated callers.

An unauthenticated user can send malformed GraphQL queries to the Parse Server and observe if the error messages reveal class names, field names, argument names, mutation names, or input-object fields.

To detect this on your system, you can use commands or tools that send malformed GraphQL queries to the server and inspect the error responses for schema disclosure.

• Use curl to send a malformed GraphQL query and check the response for "Did you mean" suggestions exposing schema details, for example:
• curl -X POST https://your-parse-server/graphql -H "Content-Type: application/json" -d '{"query":"{ malformedQuery }"}'
• Analyze the response for validation errors that include schema metadata hints.

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Mitigation Strategies

The immediate mitigation step is to upgrade Parse Server to version 8.6.78 or later, or 9.9.1-alpha.2 or later, where the vulnerability has been patched.

These versions include the SchemaSuggestionsControlPlugin which strips "Did you mean" suggestions from GraphQL validation error messages for unauthenticated requests, preventing schema metadata disclosure.

There is no code workaround other than disabling the GraphQL API entirely, which may not be feasible.

Therefore, upgrading to a patched version is the recommended and effective mitigation.

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Compliance Impact

This vulnerability allows unauthenticated users to infer internal schema metadata of the Parse Server GraphQL endpoint through error message suggestions, which could aid in reconnaissance for further attacks.

However, the vulnerability does not directly leak sensitive object data, authentication material, or personal information.

Given that the confidentiality impact is rated low and no direct data exposure occurs, the vulnerability primarily poses a risk of information disclosure that could potentially be leveraged in targeted attacks.

While this indirect exposure might raise concerns under regulations like GDPR or HIPAA that mandate protection of personal data and system security, the CVE description and resources do not explicitly address compliance impact or violations of these standards.

Organizations using affected Parse Server versions should apply the patch to reduce the risk of schema information disclosure, thereby supporting compliance efforts related to data security and privacy.

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