Individual skill
hunt-captcha-bypass
Hunt CAPTCHA Bypass — 6 distinct patterns: (1) CAPTCHA field simply omitted from the request (server-side validation absent), (2) CAPTCHA token replayed from a solved challenge (no single-use enforcement), (3) CAPTCHA response accepted on a different endpoint than it was solved on (no binding to action/session), (4) static or predictable CAPTCHA values accepted (e.g. '0', 'null', empty string), (5) audio/accessibility CAPTCHA trivially solvable programmatically, (6) CAPTCHA only enforced after N failures (first N requests bypass it). Detection: intercept a successful form submission, remove the CAPTCHA field entirely, replay — if it still succeeds, server-side validation is absent. Medium severity standalone; High when it removes the only rate-limit gate protecting a login, registration, or payment endpoint.
skills/hunt-captcha-bypass/SKILL.md
Source commit 961a0dd3d2d2f66a07a416ade3b1d4473b64802e
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- Last checked
- Nov 4, 2026
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- Nov 5, 2026
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- Apache-2.0
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- ai-agent Repository topic
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SKILL.mdcore · 6,106 bytes
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## Autonomous Testing Priority
**The fastest test: just omit the CAPTCHA field entirely. Most CAPTCHA bypass bugs are client-side-only validation.**
**Pattern 1 — Omit the CAPTCHA field (most common, most automatable):**
1. GET the form/endpoint that shows a CAPTCHA to understand its field name (usually `g-recaptcha-response`, `captcha`, `captcha_token`, `captcha_answer`, `h-captcha-response`)
2. POST the form with ALL fields EXCEPT the CAPTCHA field
3. If the action succeeds (200, redirect, or "success" message) → no server-side CAPTCHA validation
4. Proof: the state-changing action completes without a valid CAPTCHA field (compare against a baseline request that includes it)
**Pattern 2 — Empty or null CAPTCHA value:**
Instead of omitting the field entirely, include it with an empty string, `null`, `0`, or `undefined`:
```
[Credential-related source omitted]