Individual skill
mfa-bypass
2FA / OTP logic flaws — response & status tampering, brute force, OTP reuse, backup-code abuse, race conditions, missing-2FA on flows, remember-me bypass, password-reset skips 2FA.
packages/decepticon/decepticon/skills/standard/exploit/web/mfa-bypass/SKILL.md
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- Last checked
- Nov 8, 2026
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- Repository last updated
- Nov 7, 2026
- License
- Apache-2.0
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- web-application,-authentication,-mfa,-2fa,-otp,-account-takeover Declared skill tag
- security Derived category
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# MFA / 2FA Bypass Playbook
Logic flaws in the second factor are pure ATO. Common because devs ship the
*happy path* (enter code → success) and forget the negative paths: response
tampering, brute force, replay, race, alternate flows, remembered devices.
## 1. Detection — map the 2FA surface
Enumerate every flow that *should* require a second factor:
```bash
# 1. Inventory paths involved in step-up
for p in /login /login/2fa /api/2fa/verify /mfa/verify /account/security \
/account/email /account/password /password/reset /password/reset/confirm \