XSS in WordPress Plugins: Practical Prevention Guide
Cross-site scripting in WordPress plugins usually comes down to one boring truth: untrusted data reached HTML, JavaScript, or an attribute without the right escaping. I’ve reviewed a lot of plugin code over the years, and the same patterns keep showing up: $_GET echoed into admin pages option values printed without escaping post meta dropped into attributes localized script data built unsafely AJAX handlers returning HTML stitched together from user input WordPress gives you the tools to avoid this. The hard part is using the right function for the right output context. ...