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Thread: Running foreign javascipt on any website

  1. #1
    Elite Hacker
    Join Date
    Mar 2003

    Running foreign javascipt on any website

    I have a very open ended question. Are there any security concerns with being able to run javascript from anywhere on any website?

    What I mean is, let's say you go to any webpage, and after it loads you load your own JS on the fly that can be customized and can manipulate the DOM of the current page. Could that do any harm?

    Thanks in advance.

  2. #2
    Junior Member
    Join Date
    Jul 2008
    Well, it depends on the content of the javascript itself, if it means harm it might only affect the user in the system where the javascript file is at or the website if it's able to inject code through javascript in which case it depends not only in the functions used by the javascript file but also the security of the website.

    Nevertheless, you can do it if you want to, for instante Opera offers that by letting users to use their own javascript files to manipulate the content of the webpage they're visiting
    Last edited by LKP; July 23rd, 2008 at 04:29 AM.
    Simplicity is power!

  3. #3
    Just Another Geek
    Join Date
    Jul 2002
    Rotterdam, Netherlands
    Have a look at GreaseMonkey.
    Oliver's Law:
    Experience is something you don't get until just after you need it.

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