Individual skill
web-account-takeover
Systematic account-takeover hunting — password reset, email change, session, and linking flaws that seize another user's account. Load on "ATO", password-reset/forgot flows, email-change, OTP/2FA, "login as", session handling. Signals: reset tokens, email-change without re-auth, OTP, magic links.
skills/web/web-account-takeover/SKILL.md
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- Observed behavior
- Instructions only
- Last checked
- Nov 11, 2026
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- Repository last updated
- Oct 14, 2026
- License
- MIT
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# Account takeover (ATO)
## When it applies
Any flow that can grant control of another user's account: password reset, email change, session
issuance, social/SSO linking, OTP/2FA. ATO is the highest-value web finding — hunt it deliberately.
## Why it works
Auth flows have many moving parts (tokens, emails, sessions, second factors); a single weak link
— a predictable reset token, a host-header-controlled reset link, an email change without
re-auth, an OTP with no rate limit — hands over the account.
## Method
1. **Password reset**: token predictability/entropy, token not invalidated after use/expiry,
`Host`/`X-Forwarded-Host` poisoning the reset link (→ leak token to your domain), reset for