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Security · Backend / AGENT SKILL
graphql-and-hidden-parameters
0
Tests GraphQL schemas, hidden parameters, and authorization gaps.
GraphQL and hidden parameter testing playbook. Use when exploring introspection, batching, undocumented fields, hidden parameters, schema abuse, and GraphQL authorization gaps.
Understand the trade-offs.
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The full skill.
Original instructions from the publisher’s SKILL.md
# SKILL: GraphQL and Hidden Parameters — Introspection, Batching, and Undocumented Fields
> **AI LOAD INSTRUCTION**: Use this skill when GraphQL exists or when REST documentation suggests optional, deprecated, or undocumented fields. Focus on schema discovery, hidden parameter abuse, and batching as a force multiplier.
## 1. GRAPHQL FIRST PASS
```graphql
query { __typename }
query {
__schema {
types { name }
}
}
```
If introspection is restricted, continue with:
- field suggestions and error-based discovery
- known type probes like `__type(name: "User")`
- JS and mobile bundle route extraction
## 2. HIGH-VALUE GRAPHQL TESTS
| Theme | Example |
|---|---|
| IDOR | `user(id: "victim")` |
| batching | array of login or object fetch operations |
| hidden fields | admin-only fields exposed in type definitions |
| nested authz gaps | related object fields with weaker checks |
## 3. HIDDEN PARAMETER DISCOVERY
Look for:
- fields present in admin docs but not public docs
- `additionalProperties` or permissive schemas
- frontend code using richer request bodies than visible UI controls
- mobile endpoints carrying role, org, feature-flag, or internal filter fields
## 4. NEXT ROUTING
- If hidden fields affect privilege: [api authorization and bola](../api-authorization-and-bola/SKILL.md)
- If GraphQL batching changes auth or rate behavior: [api auth and jwt abuse](../api-auth-and-jwt-abuse/SKILL.md)
- If endpoint discovery is incomplete: [api recon and docs](../api-recon-and-docs/SKILL.md)Skill folder
Files included alongside SKILL.md in the publisher’s repository.