Apache Tapestry uses a special input field "t:formdata" to store data for Form component. The data is a Java serialized object and it's signed for protection against data tampering. It's very important that an attacker doesn't know the value of the secret key. Your application is using a weak/known secret key and Acunetix managed to guess this key.


Change the value of the secret "HMAC_PASSPHRASE" to a long random string.


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