hunt-business-logic
Hunting skill for business logic vulnerabilities. Built from 12 public bug bounty reports. Covers coupon-race-stacking (Instacart, Stripe, Reverb), negative-quantity-in-cart price tampering (Upserve, Eternal/Zomato), decimal/fraction price-field overflow (Shipt), client-side checkout amount trust on PayPal redirect (WordPress.org), price-per-unit mass-assignment (Krisp), and archived-price swap / cart-TOCTOU (Stripe). Use when hunting business logic — heavy emphasis on financial-impact-demonstrated cases.
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Critical
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Security
2 findings: 1 critical severity, 1 medium severity. Installing this skill is not recommended: please review these findings carefully if you do intend to do so.
E004: Prompt injection detected in skill instructions.
What this means
Detected a prompt injection in the skill instructions. The skill contains hidden or deceptive instructions that fall outside its stated purpose and attempt to override the agent’s safety guidelines or intended behavior.
Why it was flagged
The document contains explicit, actionable instructions for abusing payment flows, forging webhook callbacks, and bypassing rate limits to commit financial fraud and other harmful actions.
W009: Direct money access capability detected (payment gateways, crypto, banking).
What this means
The skill is specifically designed for direct financial operations, giving the agent the ability to move money or execute financial transactions — such as payment processing, cryptocurrency operations, banking integrations, or market order execution.
Why it was flagged
The skill is explicitly about attacking and manipulating payment flows and webhooks. It includes concrete payloads and curl examples that post payment-initiate and payment/callback requests, guidance to tamper amounts (e.g., set amount=0.01), and numerous Stripe/PayPal-specific examples and real-impact cases (coupon/gift-card/price manipulation, Stripe webhook/exploit scenarios). Those are specific, actionable instructions to induce or fake financial transactions/confirmations on payment endpoints — i.e., direct financial execution capability.
- Repository
- elementalsouls/Claude-BugHunter
- Commit
646b72e
- Audited
- Security analysis
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