Double-Submit-Cookies-Patterns

Double Submit Cookie 


Double Cookie Submit For Prevent CSRF


What is Double Submit Cookie?

If storing the CSRF token in session is problematic, an alternative defense is the use of a double submit cookie. ... A cross-origin attacker cannot read any data sent from the server or modify cookie values, per the same-origin policy.


In the event that putting away the CSRF token in session is hazardous, an elective guard is the utilization of a twofold submit treat. A twofold submit treat is characterized as sending an irregular incentive in both a treat and as a demand parameter, with the server checking if the treat esteem and demand esteem match. when a client confirms to a site, the site ought to create a (cryptographically solid) pseudorandom esteem and set it as a treat on the client's machine isolate from the session id. The site does not need to spare this incentive in any capacity, in this manner evading server-side state. The site at that point requires that each exchange ask for incorporate this irregular incentive as a shrouded frame esteem (or other demand parameters). A cross root aggressor can't read any information sent from the server or alter treat esteems, per the same-cause strategy. This implies while an aggressor can compel a casualty to send any esteem he needs with a malignant CSRF ask for, the assailant will be not able to change or read the esteem put away in the treat. Since the treat esteem and the demand parameter or shape esteem must be the same, the assailant will be not able to effectively drive the accommodation of a demand with the arbitrary CSRF esteem.

Gollowing method explains how it works



At first, you will get a login that needs to enter Username and Password.
Username: admin
Password: password

After you press the login button the process will start to begin.


using java-script we can load csrf token into form filed with hidden values. also in here we also check user submissions in back-end, whenever user request a page he/she gets a totally random value, so he/she cant predict it and perform exploitation against legitimate users.



Find the sample code here.

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