GraphQL Field Suggestions Enabled
Description
GraphQL field suggestions are enabled in your production environment. When a client queries an invalid or non-existent field, GraphQL returns helpful error messages suggesting valid field names (e.g., "Did you mean 'username'?"). While useful during development, this feature exposes internal schema details to potential attackers in production, allowing them to systematically discover available fields, relationships, and data structures without proper authorization.
Remediation
Disable field suggestions in production environments by implementing custom error handling that masks schema details:
For Apollo Server:
Configure the formatError function to suppress suggestion messages in production:
const server = new ApolloServer({
typeDefs,
resolvers,
formatError: (error) => {
// Remove field suggestions from error messages
if (process.env.NODE_ENV === 'production') {
return new GraphQLError('Invalid query', {
extensions: {
code: error.extensions?.code || 'BAD_REQUEST'
}
});
}
return error;
}
});
For GraphQL.js:
Implement custom validation error handling to strip suggestion text:
const result = await graphql({
schema,
source: query,
customFormatErrorFn: (error) => {
if (process.env.NODE_ENV === 'production') {
// Remove 'Did you mean...' suggestions
const message = error.message.split('Did you mean')[0].trim();
return { message };
}
return error;
}
});
General Best Practices:
• Maintain separate configurations for development and production environments
• Enable detailed error messages only in development/staging with IP restrictions
• Implement rate limiting to prevent automated schema discovery attempts
• Monitor for suspicious patterns of invalid field queries
• Consider disabling introspection in production as an additional security measure