Credential Stuffing Scanner
Evaluates defenses against automated credential stuffing attacks.
What is Credential Stuffing?
Credential Stuffing testing evaluates protection against attacks using stolen username/password pairs from data breaches. Attackers automate login attempts across many accounts using credentials leaked from other sites, exploiting password reuse. This differs from brute force in that credentials are already known to work somewhere.
Why is This Important?
Credential stuffing is extremely effective because users reuse passwords. Breach databases contain billions of credentials. Automated tools can test thousands of accounts per minute. Successful attacks provide access to the specific accounts where users reused their breached passwords.
How It Works
1. Auth Flow Analysis
Maps authentication mechanisms including login, registration, password reset, and session management flows.
2. Security Testing
Tests for authentication bypasses, weak credentials, session flaws, and token vulnerabilities.
3. Access Verification
Validates findings by demonstrating unauthorized access or privilege escalation paths.
Key Capabilities
Comprehensive authentication security testing to protect user accounts and prevent unauthorized access.
- Complete authentication flow analysis
- Token and session security validation
- Password policy and brute-force testing
- Multi-factor authentication bypass detection
- OAuth, SAML, and JWT security assessment
Frequently Asked Questions
How is credential stuffing different from brute force?
Brute force guesses passwords through combinations. Credential stuffing uses known-valid username/password pairs from breaches. This makes it faster (fewer attempts needed), harder to detect (attempts look like legitimate logins), and more successful (passwords are known to work).
What makes credential stuffing attacks successful?
Success factors: password reuse is epidemic (65%+ of users), billions of breached credentials available, attacks distributed across IPs evade rate limits, low-and-slow attacks avoid detection, and successful logins look identical to legitimate ones.
What defenses work against credential stuffing?
Effective defenses: check passwords against breach databases (HaveIBeenPwned), device fingerprinting to detect new devices, behavioral analysis for bot detection, multi-factor authentication, login notifications, impossible travel detection, and CAPTCHA for suspicious patterns.
How should I test credential stuffing defenses?
Test: detection of breach-listed passwords, bot detection with automation tools, rate limiting across distributed IPs, notification systems for new devices, detection of unusual login patterns, and effectiveness of MFA prompts. Use safe test credentials.
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