# Web App Logic

> Web application logic testing - business logic flaws, race conditions, access control, cache poisoning/deception, and information disclosure.

- **Type:** Skill
- **Install:** `agentstack add skill-transilienceai-communitytools-web-app-logic`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [transilienceai](https://agentstack.voostack.com/s/transilienceai)
- **Installs:** 0
- **Category:** [Security](https://agentstack.voostack.com/c/security)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [transilienceai](https://github.com/transilienceai)
- **Source:** https://github.com/transilienceai/communitytools/tree/main/skills/web-app-logic
- **Website:** https://www.transilience.ai/

## Install

```sh
agentstack add skill-transilienceai-communitytools-web-app-logic
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Web Application Logic

Test for logic flaws and application-specific vulnerabilities that automated scanners miss.

## Techniques

| Type | Key Vectors |
|------|-------------|
| **Business Logic** | Workflow bypass, price manipulation, feature abuse |
| **Race Conditions** | TOCTOU, limit bypass, double-spend, parallel requests |
| **Access Control** | IDOR, horizontal/vertical privilege escalation, forced browsing |
| **Cache Poisoning** | Unkeyed headers/parameters, fat GET, response splitting |
| **Cache Deception** | Path confusion, static extension tricks, normalization |
| **Info Disclosure** | Error messages, debug endpoints, source code, metadata |

## Workflow

1. Map application workflows and business rules
2. Identify state-dependent operations and trust boundaries
3. Test logic assumptions with edge cases and race conditions
4. Verify access control across user roles
5. Document impact with PoC demonstrations

## Reference

- `reference/business-logic*.md` - Business logic testing techniques
- `reference/race-conditions*.md` - Race condition exploitation
- `reference/access-control*.md` - Access control bypass methods
- `reference/web-cache-poisoning*.md` - Cache poisoning techniques
- `reference/web-cache-deception*.md` - Cache deception attacks
- `reference/information-disclosure*.md` - Information disclosure testing

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [transilienceai](https://github.com/transilienceai)
- **Source:** [transilienceai/communitytools](https://github.com/transilienceai/communitytools)
- **License:** MIT
- **Homepage:** https://www.transilience.ai/

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-transilienceai-communitytools-web-app-logic
- Seller: https://agentstack.voostack.com/s/transilienceai
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.