Security Concerns with Front End Filters for Posts

Hi Guys,

i posted this thread on the troubleshoot forum. I figured, this topic fits here best. Here is my issue:

i am looking to create multiple front end filters, for users to sort and filter through posts. I have created multiple custom taxonomies, which i would like to use for this matter. Very similirar to how you would sort through products in an e-commerce store.

I have found this blog post, that has tipped me into the right direction on how to tackle this, but i have come across some concerns.

If i use URL parameters to apply values to filter the query, how do i make sure i dont pick up some nasty scrips or code through the URL? Is there some WP core function that handles injections?

Is using URL parameters a viable approach to this issue in the first place? Are there any other best practice methods on resolving this?

I have looked into a couple of plug-ins on this topic that offer short code search forms, but none meet the implementation needs in order for me to create a userfriendly search form the way i want it. Anyhow, i am very open to plug-in suggestions as well.

Update
I also found this post, that pretty much sums up my concerns.

http://www.joellipman.com/articles/web-development/503-basic-tests-for-sql-injection-vulnerabilities.html

I would want to avaoid going through all that processing for each parameter value. How does WP handle input provided by the search form? Is there some third party framework, that i could use?

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Help much appreciated.
Thomas