SecurityHeaders

Web Security Essentials: XSS, CSRF, and Beyond Web security is essential for every site. XSS and CSRF show how a small mistake can affect many users. This post explains what these flaws are and offers practical steps you can apply today. You’ll find clear explanations and concrete tips you can use in most projects. XSS stands for Cross-Site Scripting. It happens when a site uses user input without proper checks and then displays that input in a page. An attacker can insert a script that runs in another visitor’s browser. There are several flavors—stored, reflected, and DOM-based—but the safe rule is simple: treat every input as untrusted and escape output where it will be shown. ...

Content Security Policy and Modern Web Security Content Security Policy (CSP) is a set of browser rules that tell a page where to load resources from. It helps reduce cross-site scripting (XSS) and other injection risks. With many sites moving to dynamic content, CSP is a key part of modern web security. It works best when combined with HTTPS and careful coding practices. A CSP can be delivered by an HTTP header named Content-Security-Policy or, in simple cases, by a meta tag. The header is widely supported and applies to all subresources. A common starting point is a policy that limits all loads to the site itself: default-src ‘self’. From there, teams add sources for scripts, styles, images, and fonts. ...