Vulnerability Fixation
Vulnerable Forgot Password Link Attack

How to Implement a Secure “Forgot Password” Feature

The “forgot password” feature is common on login pages but is it secure? This feature can be a gateway for attackers if not implemented properly, so it must be protected.

How the “forgot password” flow works (simple):

  1. User clicks “Forgot password” and submits their email.
  2. Server verifies the email and sends a reset link to that address.
  3. User clicks the link and is directed to a page to set a new password.

Early implementations were unsafe: originally, clicking “Forgot password” could immediately open a reset form with no verification, allowing attackers to take over accounts.

Improved workflow and important protections:

  • Always verify the submitted email on the server side (client-side checks are not enough).
  • Use time-limited reset links — a token should expire after a reasonable interval.
  • Make reset links single-use: once a password is reset the token must be invalidated and cannot be reused.

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