Individual skill
hunt-exceptional-conditions
Hunt mishandling of exceptional conditions — feed an endpoint malformed/unexpected input (wrong type, broken JSON, oversized field, null byte) and make it fail OPEN or leak internals: a verbose stack-trace / framework error page that discloses ORM internals, server file paths, library versions, or a language traceback. Use on any input-accepting endpoint (JSON APIs, forms, query params). Medium-High when the leak exposes internal structure that arms a deeper attack.
skills/hunt-exceptional-conditions/SKILL.md
Source commit d67cc00d9297a15b9210121e0a93c33f9fb6be46
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- Network or broad shell
- Last checked
- Nov 9, 2026
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- Repository last updated
- Nov 8, 2026
- License
- MIT
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- ai-security Repository topic
- anthropic Repository topic
- application-security Repository topic
- bug-bounty Repository topic
- bugbounty Repository topic
- bugcrowd Repository topic
- claude Repository topic
- claude-code Repository topic
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- ethical-hacking Repository topic
- engineering Derived category
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# HUNT-EXCEPTIONAL-CONDITIONS — Verbose Errors / Fail-Open (A10:2025)
## What actually pays
Well-built apps catch errors and return a clean, generic message. A broken app,
when handed input it didn't expect, throws an unhandled exception and renders a
**developer error page** straight to the client — leaking the stack trace, the
ORM/query internals, server-side file paths, and framework/library versions.
That disclosure is the finding (and it arms SQLi/RCE/path attacks next).
## Recon
Any endpoint that parses input is a candidate; the richest are:
