Versions of the package jquery-validation before 1.20.0 are vulnerable to Cross-site Scripting (XSS) in the showLabel() function, which may take input from a user-controlled placeholder value. This value will populate a message via $.validator.messages in a user localizable dictionary.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.