What I meant was, if you have a file that runs some business logic on the front end and that file can be subverted by loading an alternative copy from the hackers local machine and you don't re-validate server-side ...
That's not really anything unique to this. You would have the same problem with any browser extension or userscript. This isn't even a problem unique to the browser. Client side validation is a hard to enforce concept. However, being able to supply your own files is hardly a vulnerability.
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What I meant was, if you have a file that runs some business logic on the front end and that file can be subverted by loading an alternative copy from the hackers local machine and you don't re-validate server-side ...
That's not really anything unique to this. You would have the same problem with any browser extension or userscript. This isn't even a problem unique to the browser. Client side validation is a hard to enforce concept. However, being able to supply your own files is hardly a vulnerability.