[jQuery] Spammer bypassing JQ Validate to register?

[jQuery] Spammer bypassing JQ Validate to register?


I have a site built in ExpressionEngine. I am using JQ Validate to
check the form fields before submission. There are 3 fields in
particular that are interesting to me as they are required by EE and
they are on the list of fields required by JQ Validate.
First Name
Last Name
Invitation Code (provided by the site owner to visitors who can
register)
So, this dude from Poland managed to register without a first name,
without a last name and likely without an invitation code. I'll deal
with the EE issues separately, but is there a known issue where
someone can mess with the jquery in the page to bypass the validation
that is running?