For a Rails API, keep signed-in password changes separate from password recovery, verify the user’s identity again before either a password or registered email change, and keep a new email address pending until it is confirmed. Rails’ current settings walkthrough demonstrates these patterns, but its controller and form examples are not a universal JSON API specification: adapt them to your authentication system, request format, and response contract.
Keep password changes separate from password recovery
A signed-in user changing a password and a user recovering access are different security flows. Rails’ Sign Up and Settings guide illustrates a separate settings password route for an authenticated user, rather than reusing the password-recovery controller. In an API, preserve that separation in your own route and handler design so each flow has the right identity checks and token rules.
For recovery, the Rails Securing Rails Applications guide documents the authentication generator’s reset-token flow, with a 15-minute default token validity in that documented setup. Treat that duration as the generator’s default, not a required lifetime for every Rails application; it is configurable through has_secure_password.
Require fresh proof of identity for sensitive changes
A valid session or bearer token alone may not be enough to authorize changing a password or the address used for account recovery. OWASP’s Authentication Cheat Sheet recommends re-authentication for sensitive account changes. Its API Security Top 10:2023 guidance on broken authentication also warns that an attacker who obtains a token could change an account email and then use password recovery to take over the account.
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Resolve the target account from the authenticated principal, not from an account ID the client supplies. Require a fresh credential check or an equivalent authenticator bound to the user before applying the change. The exact Rails route, JSON fields, HTTP status codes, and token-rotation policy depend on your application; the Rails walkthrough does not define a standard API contract.
Implement a signed-in password change
The Rails settings example uses a dedicated Settings::PasswordsController, takes the current user from the authenticated request, and updates that user with a PATCH action. It permits the new password, password confirmation, and a password_challenge. With has_secure_password, Rails validates the challenge against the password currently stored for the user.
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- Authenticate the request. Identify the account from the authenticated session or token rather than trusting a client-selected account identifier.
- Require the current-password challenge. Do not let a missing field silently skip the check. The guide’s example uses
with_defaults(password_challenge: "")so the validation still runs when a client omits the challenge. - Validate and update the new password. Accept the new password and its confirmation, then return a response consistent with your API’s success and validation-error contract.
- Protect the recovery flow independently. A user who cannot authenticate should use the password-reset process, with its own token validation, expiry, and abuse controls.
Rails’ security guide says the authentication generator adds bcrypt and stores a password hash, not a reversible plain-text password. In the documented has_secure_password behavior, password presence on creation, confirmation, and a maximum of 72 bytes are handled automatically. The guide does not set a minimum length or complexity policy; those requirements must be chosen and enforced by the application.
Stage email changes until the new address is confirmed
Do not immediately replace the registered email with an address the user has not proved they control. The Rails settings walkthrough adds an unconfirmed_email field, accepts a proposed address with the password challenge, and sends a confirmation message to that proposed address. The existing registered address remains in place until the confirmation token is verified; on success, Rails moves the pending address into the registered email field and clears the pending value.
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The walkthrough’s example binds the confirmation token to the pending email value and configures it to expire after seven days. That is an example setting, not a universal expiry requirement. OWASP’s Authentication Cheat Sheet likewise recommends storing a pending change and using time-limited nonces, with messages to the existing and proposed addresses.
Choose email verification steps based on MFA
OWASP distinguishes the verification path according to whether the account has multi-factor authentication enabled. Both paths should preserve the pending state until the change is confirmed.
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| Account setup | Identity check and confirmation |
|---|---|
| MFA enabled | Use MFA as additional proof for the change, then require confirmation of the pending address. Notify the existing and proposed addresses as appropriate to the chosen flow. |
| Password-only | Verify the current password and require the confirmation steps for both addresses described by OWASP; notify the existing and proposed addresses. |
These checks serve different purposes: re-authentication establishes that the requester is authorized to make a sensitive change, while confirmation establishes control of the proposed email address. Do not treat a successful password challenge as proof that the user owns a different inbox.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Protect every authentication and recovery endpoint
OWASP API2:2023 recommends brute-force protections for credential-recovery endpoints as well as sound authentication controls. Review the complete set of routes used by browser clients, mobile apps, and recovery flows—not only the login route. Apply rate limits and appropriate monitoring to password-reset requests and other credential-related endpoints, while ensuring legitimate users have a usable recovery path.
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CSRF defenses depend on how credentials are transported. Rails’ security guide advises protecting password-change forms against CSRF, especially relevant to browser flows that authenticate with cookies. For an API, assess the actual cookie, token, and browser exposure rather than assuming browser-form guidance applies unchanged.
Adapt the Rails examples to your application
The Rails guides show useful patterns, not a drop-in API implementation. The settings walkthrough uses current Rails conventions such as params.expect; route helpers, parameter handling, and supported authentication arrangements can vary by Rails version and architecture. Before adopting the sample, confirm your Rails version, authentication mechanism, session or token design, and MFA policy.
Quick Recap
- Keep the signed-in password update handler distinct from password recovery.
- Bind the operation to the authenticated principal and require fresh identity verification.
- Represent proposed email changes separately from the currently registered address.
- Use an expiring confirmation mechanism and update the registered address only after verification.
- Define and test the API’s own request schema, response codes, validation behavior, and credential policy.
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