In Struts, form validation is used to validate the data the application’s clients provide as part of a form submission to the server. Configuring
two different form validations with the same name leads to unexpected behaviors.
When faced with multiple form validations with the same name, Struts will arbitrarily choose one and apply it while discarding the others.
What is the potential impact?
The application might perform an incomplete validation of user-submitted forms. Some parts of the validation configuration defined in discarded
items will not apply, which can have severe consequences if not duplicated in the applied one.
Missing input validation can make the application vulnerable to injection attacks or other severe issues. They might affect the confidentiality,
integrity, or availability of the application or the data it stores.
