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.

knowledge/Claude-BugHunter/skills/hunt-exceptional-conditions/SKILL.md

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Last checked: Nov 4, 2026

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License: Apache-2.0

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SKILL.mdcore · 3,144 bytes
SKILL.mdcore · 3,144 bytes

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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: