api-authorization-and-bola

api-authorization-and-bola is a skill for Claude Code, Codex from DorianGallo/hack-skills-local. It costs 36 tokens per session (447 once invoked), scanned A, a copy of api-authorization-and-bola, MIT.

A guide to testing whether an API checks that each user is allowed to access a requested object or function. BOLA means an API exposes another user’s object by changing its identifier; BFLA means it exposes a function meant for another role.

In plain words
What is it for?
Use it to compare access between two accounts, test read/create/update/delete routes, inspect nested resources, and check fields such as roles, organizations, verification, or tiers.
Why use it?
It helps find missing checks on object IDs, nested resources, alternate HTTP methods, administrative functions, and hidden writable fields. These gaps can expose or change other users’ data.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to compare access between two accounts, test read/create/update/delete routes, inspect nested resources, and check fields such as roles, organizations, verification, or tiers.

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Install with agentmods
npx agentmods add skills/doriangallo/hack-skills-local/api-authorization-and-bola
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add DorianGallo/hack-skills-local --skill api-authorization-and-bola
Clone the repo
git clone --depth 1 https://github.com/DorianGallo/hack-skills-local

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for api-authorization-and-bola

README.md
[![agentmods](https://agentmods.dev/badge/skills/doriangallo/hack-skills-local/api-authorization-and-bola/github.svg)](https://agentmods.dev/skills/doriangallo/hack-skills-local/api-authorization-and-bola)
Your own site
<a href="https://agentmods.dev/skills/doriangallo/hack-skills-local/api-authorization-and-bola"><img src="https://agentmods.dev/badge/skills/doriangallo/hack-skills-local/api-authorization-and-bola/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for api-authorization-and-bola

Your own site · 80×15
<a href="https://agentmods.dev/skills/doriangallo/hack-skills-local/api-authorization-and-bola"><img src="https://agentmods.dev/badge/skills/doriangallo/hack-skills-local/api-authorization-and-bola.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 447 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00036 $0.00447
Opus 5 $0.00018 $0.00224
Sonnet 5 $0.00007 $0.00089
Haiku 4.5 $0.00004 $0.00045

Measured 10d ago against content hash 449db8e0e1fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

api-authorization-and-bola scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

100% identical to api-authorization-and-bola — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/api-authorization-and-bola/SKILL.md · 48 lines

What it actually says

SKILL: API Authorization and BOLA — Object Access, Function Access, and Mass Assignment

AI LOAD INSTRUCTION: Use this skill when an API exposes object IDs, nested resources, or role-sensitive functions and you need a focused authorization test path: BOLA, BFLA, method abuse, and hidden field control.

1. CORE TEST LOOP

  1. Create Account A and Account B.
  2. As Account A, capture create, read, update, and delete flows.
  3. Replay with Account B's token.
  4. Test sibling endpoints, nested endpoints, and alternate HTTP verbs.

2. TEST SURFACES

Surface Example
object read /api/v1/orders/123
nested object /api/v1/users/1/invoices/9
admin or internal function /api/v1/admin/users
update path PUT, PATCH, DELETE variants
hidden JSON fields role, org, verified, tier

3. QUICK PAYLOADS

{"role":"admin"}
{"isAdmin":true}
{"org":"target-company"}
{"verified":true}

4. WHAT TESTERS MISS

  • object IDs in headers, cookies, GraphQL args, and nested objects
  • alternate methods sharing the same route but weaker authz
  • parent check present, child resource check missing
  • admin docs revealing extra writable fields

5. NEXT ROUTING

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 48 lines · 36 tokens per session scan A 449db8e0e1fd

Subscribe to this mod's changes

api-authorization-and-bola is a skill published in the GitHub repository DorianGallo/hack-skills-local (5 stars, last pushed 3mo ago), licensed MIT. It adds 36 tokens to every session and 447 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to api-authorization-and-bola, differing in 0 lines, and is treated as a copy.

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