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When does a nonce in WordPress become invalid?
The other way a nonce can become invalid is if a user’s session token changes. That state change occurs when a user logs out and back in again. Since a new session token is generated, all previous nonces won’t validate anymore. To make things clearer, WordPress doesn’t store the nonce it creates for a user.
Which is an example of a nonces in WordPress?
An example of this is an attacker putting up a script on his website that POST to a form on your website automatically on an authenticated user session without the user really wanting to do that specific action. That was a mouthful!
How long does a nonce stay valid in WordPress?
The way WordPress implements nonces lacks the one part that makes a nonce a nonce, it’s “used ONCE” part. WordPress creates a nonce that will remain valid for at least 12 hours by default (can be valid for up to 24 hours).
How does a nonce work in a website?
This Nonce is generated by a server-side application, stored on the server and sent to the client to be part of the payload it’s going to send back to the server. This way, you have a way to validate the payload and have a higher level of certainty that the request was actually made by the client. Why use a Nonce?
Why do we need nonces in WordPress plugins?
WordPress nonces are an easy piece of security measure you can implement into your plugins or themes to prevent your users from Cross Site Request Forgery attacks. But how do WordPress nonces really work? You heard they were valid for 24 hours? Are they really? How can they be called nonces if they can be reused?
How is nonce used to validate a request?
This Nonce is generated by a server-side application, stored on the server and sent to the client to be part of the payload it’s going to send back to the server. This way, you have a way to validate the payload and have a higher level of certainty that the request was actually made by the client.