A security engineer identified several implementation pitfalls when building passwordless "magic link" authentication systems, including the need for short expiration times, single-use links, sufficient entropy in secret codes, and explicit user confirmation clicks to prevent accidental activation by link preview tools. The author also recommended that magic links verify codes in the background while directing users to return to their original browser tab to complete login, rather than logging in within the email client's embedded browser.
Otto Beta
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A security engineer identified several implementation pitfalls when building passwordless "magic link" authentication systems, including the need for short expiration times, single-use links, sufficient entropy in secret codes, and explicit user confirmation clicks to prevent accidental activation by link preview tools. The author also recommended that magic links verify codes in the background while directing users to return to their original browser tab to complete login, rather than logging in within the email client's embedded browser.