Individual skill
hunt-brute-force
Hunt Missing/Weak Rate Limiting — login brute force, OTP/2FA brute force (10^6 keyspace), password-reset-token brute, credential stuffing, username/email enumeration via error-string / status-code / timing differences, weak password policy, missing CAPTCHA (CAPTCHA token replay / single-use / concurrency-window bypass specifics → hunt-captcha-bypass), IP-based rate-limit bypass via X-Forwarded-For and friends, ReDoS. Distinguishes hard lockout vs soft IP-throttle vs CAPTCHA-injection vs silent shadow-throttling (avoids false-negative 'no rate limit' conclusions). Medium to Critical depending on what the brute reaches (OTP→ATO = Critical).
skills/hunt-brute-force/SKILL.md
Source commit d67cc00d9297a15b9210121e0a93c33f9fb6be46
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- No
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Not checked yet
- Last checked
- Nov 4, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 5,492
- Repository last updated
- Nov 7, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- 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
- claude-skills Repository topic
- ethical-hacking Repository topic
- engineering Derived category
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Read excerpt
# HUNT-BRUTE-FORCE — Rate Limiting / Brute Force / Enumeration
> Grounding note: this skill is built from published technique classes, not from a
> curated set of named HackerOne reports. `report_count` is intentionally `0` — do
> not cite an exact payout or report ID you cannot verify. Where a public case is
> well-documented (e.g. Laxman Muthiyah's Instagram password-reset OTP race/rotation
> research, 2019–2021), it is named below as a *technique reference*, not a payout claim.
## Crown Jewel Targets
OTP brute force (6-digit = 1,000,000 combinations) with no effective rate limit = Critical ATO bypass.
**Highest-value chains:**
- **OTP / 2FA brute → MFA bypass → ATO** — no effective rate limit on `/verify-otp`, full 000000–999999 keyspace reachable