What are the rules for securely resetting and recovering a forgotten password in web applications?

The lost access recovery process is one of the most vulnerable spots in any authentication system. If an attacker manages to bypass this logic, they will gain full control over someone else's account, bypassing the primary password. Therefore, developing a reliable reset mechanism requires strict risk vectorization and adherence to security standards.

The first step when requesting recovery is sending a unique one-time token to a verified communication channel, such as the email address or phone number linked to the profile. It is important that the application interface does not reveal whether the entered address is registered in the system to prevent malicious actors from harvesting an active user database.

The recovery token itself must have sufficient cryptographic strength and be generated using a secure pseudorandom number generator. The token must have a strictly limited lifespan, typically ranging from fifteen to thirty minutes. After successful use or expiration, the token must be guaranteed to be deleted from the database.

To prevent the interception of recovery links via browser history or mail server logs, it is recommended to use a POST request method or display a one-time numeric code instead of a long direct link. The confirmation code is entered directly on the website in a secure interface, minimizing the risks of accidental leakage.

After successfully passing identity verification, the system must forcefully terminate all active user sessions across all devices. This ensures that if an attacker previously gained access to an old session, they will be immediately logged out of the system after the password change. It is also useful to send a notification to all backup contacts of the account owner stating that credential changes have been requested.