Glossary
Magic link authentication is a passwordless method that logs a user in by sending a unique, single-use link to their email (or sometimes SMS); clicking it authenticates them without a password. It leans on the user’s control of their inbox as the proof of identity.
Magic links are popular for their simplicity (no password to create or remember) and they’re a common first step toward passwordless. But their security profile deserves an honest look.
When a user enters their email to log in, the service generates a one-time, time-limited link tied to that request and emails it. Clicking the link within the window authenticates the session. The link is single-use and expires, which limits replay.
The appeal is low friction and no stored password. The limitations are important:
Magic links are a reasonable option for low-to-moderate-risk consumer logins and a clean upgrade from passwords for many apps. For higher-value accounts (banking, payments) they’re usually not strong enough on their own, since email-based control is a weaker anchor than a phishing-resistant passkey. Many businesses use magic links as one method within a broader passwordless strategy, applying stronger factors (passkeys, step-up) where risk or value is higher.
Is magic link authentication secure?
It’s reasonable for lower-risk logins but depends entirely on the security of the user’s email account.
How is a magic link different from a passkey?
A passkey uses phishing-resistant cryptography on the device; a magic link relies on control of an email inbox.
Can magic links be phished?
Yes, a link can be phished or misused if email is intercepted within its valid window.
Related: Passwordless Authentication · One-Time Password (OTP) · Passkeys · Password Alternatives
