Use a well-documented and actively maintained escaping/encoding library.

Always use libraries/modules/packages offering safe APIs, such as parameterized statements.

Gracefully reject invalid input, make sure not to reveal excessive information about how the API and its validation works.

Write custom GraphQL validators for more complex validations. Use specific GraphQL data types such as scalars or enums.

Following are some of the mitigation points we can consider while developing applications using GraphQL. We have exploited GraphQL but more importantly we need to look at mitigating these issues. We have already seen it in the previous blog post.Īnd now we know the vulnerabilities exist in the portal. GraphQL Voyager gives a visual representation of the schema for a specific graphql implementation based on introspection query results. There are multiple tools available but we will be looking at some of them in this post. We can send multiple requests to single endpoint in a single request without worrying about getting blocked. You would have an idea where the things can go wrong. “Batching is where multiple requests for data from a back end are collected over a short period of time and then dispatched in a single request to an underlying database or microservice by using a tool like Facebook’s DataLoader. Some of them are -īatching attack: To understand this attack, basic knowledge about batching is required. Implementation of GraphQL is a complex process and due to this fact few bugs are common and prevalent in GraphQL. API10:2019 - Insufficient logging and monitoring.API5:2019 - Broken function level authorization.API4:2019 - Lack of resources and rate limiting.API1:2019 - Broken object level authorization.Which includes the following but not limited to. Let’s cut to the chase and come straight to the point, all the bugs which can be found in REST APIs can be found in the GraphQL. Vulnerabilities in GraphQL Implementation In this blog we will go through a demo application called Generic University created by awesome InsiderPHD to understand some basic bugs and craft a methodology to test GraphQL. I highly recommend you to go through the post, if not already. We have already gone through basics in the previous post. I am back with another part of the Hacking GraphQL series.

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