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's' is often used as the variable name for search terms. If the developer doesn't escape properly, and they used double quotes in their code, I think this particular bit would parse and stop script execution with the output that is the sha1 encrypted string of 'xyzt', which one would assume the sender knows. This would then mean that your search endpoint doesn't escape properly and is capable of evaluating php code, which means it could potentially output credentials, secrets, or simply damaging information. And yes, WordPress uses 's' as the search variable name by default - as do other CMS systems and frameworks, but as requinix pointed out WordPress has more than it's fair share of issues and potential vulnerabilities.

There are some tools that can help you: A source scanner: https://github.com/kgoedecke/unused-css-parser A site that will analyze your pages: https://unused-css.com/ Unused-css will let you analyze one site for free up to 100 pages.

No. You will not.