How to mitigate account enumeration risks with passkeys?

How Can Organizations Mitigate Account Enumeration Risks in Passkey Implementations?#

Account enumeration risks occur when an attacker can determine whether an account exists based on system responses during login. In passkey implementations, this risk often arises with methods like the "Identifier-First Approach." Here’s how organizations can mitigate these risks:

1. Implement Proactive Bot Management#

• Use tools like CAPTCHAs (e.g., Cloudflare Turnstile) to prevent automated attacks that attempt to identify valid accounts.
• Monitor traffic patterns to detect and block suspicious activity.

2. Use Generic Error Messages#

Avoid exposing whether an account exists by using generic error messages. For example: Instead of "This email is not registered," display "Login failed. Please check your credentials."

3. Rate Limiting and Throttling#

• Limit the number of login attempts or identifier lookups per IP address or session.
• Introduce delays between repeated attempts to deter brute-force enumeration attacks.

4. Multi-Stage Verification#

• Require additional verification steps (e.g., CAPTCHA or SMS) after a certain number of failed attempts.
• Use adaptive authentication techniques to dynamically adjust security measures based on risk levels.

5. Implement Detection Logic#

• Track unusual patterns, such as high volumes of failed identifier checks, and flag or block potentially malicious activity.
• Use advanced threat detection tools to identify and respond to enumeration attempts.

6. Educate Users#

Inform users about the importance of using unique, strong identifiers (e.g., usernames or email addresses) to reduce vulnerability to enumeration attacks.

By adopting these strategies, organizations can safeguard user privacy and security without compromising the user experience in their passkey implementation.

Read the full article#

About Corbado

Corbado is the Authentication Intelligence Platform for CIAM teams running consumer authentication at scale. 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 (+80% passkey activation). Talk to a Passkey Expert →