What is Credential Stuffing?

Understand what credential stuffing is, how it impacts security, and ways to protect against this common cyber attack.

Credential stuffing is a cyber attack where stolen account credentials are used to gain unauthorized access to user accounts across various platforms. This method exploits the common practice of password reuse across different services to break into accounts, making it a common threat in the digital age.

• Credential Stuffing: An attack method using stolen usernames and passwords to access multiple accounts.
• Highly reliant on the reuse of passwords across different services.
• Can be mitigated by unique passwords for each site and enabling two-factor authentication.

Detailed Insights into Credential Stuffing

Credential stuffing operates by automating login requests using breached username and password pairs. This type of attack leverages large-scale automated tools that simulate a flood of login attempts, bypassing typical security measures like rate limiting or CAPTCHA by distributing the attempts across numerous IP addresses.

How It Works

• Data Breach Source: Attackers obtain credentials from data breaches, where large volumes of personal data are illegally accessed and sold.
• Automation: Specialized software automates the login attempts across various websites, testing the stolen credentials en masse.
• Success Rates: Despite low success rates per attempt, the sheer volume of attempts can make this attack method lucrative.

Why It's Effective

• Password Reuse: Many users employ the same password across multiple sites, increasing vulnerability.
• Advanced Bots: Modern bots can mimic human login patterns, making them harder to detect.
• Volume of Attacks: Millions of attempts can statistically secure access to thousands of accounts.

Preventive Measures

Businesses and individuals can significantly reduce the risk of credential stuffing by implementing and adhering to robust security practices:

• Unique Passwords: Encourage or enforce the use of unique passwords for each service.
• Two-Factor Authentication ( 2FA): Adding a second layer of security can effectively neutralize the risk posed by compromised passwords. Passkeys are also a more secure alternative.
• Awareness and Education: Regularly inform users about the importance of security best practices.

Credential Stuffing FAQs

• What is the difference between credential stuffing and brute force attacks?

  • Credential stuffing uses pre-existing username and password combinations, while brute force attacks attempt to guess passwords without prior knowledge.

• How can individuals protect themselves against credential stuffing?

  • Always use unique passwords for different sites and enable two-factor authentication wherever available.

• What role do bots play in credential stuffing?

  • Bots automate the login attempts, using varying IPs and device identifiers to mask the attack, making them look like legitimate user traffic.

About Corbado

Corbado is the Passkey Intelligence Platform for large-scale CIAM teams running consumer authentication. We help you see what IDP logs and generic analytics tools can't: where passkeys, passwords, OTP, social login and fallback journeys succeed, stall or fail, which devices and browsers create friction, and when an OS update silently breaks login. Two products: Corbado Observe layers process mining and observability across authentication journeys. Corbado Connect adds managed passkeys with analytics built in alongside your IDP. VicRoads runs passkeys for 5M+ users with Corbado (more than 80% passkey activation rate).

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