XSS

1. Core Security Foundations Treat all input as untrusted. Validate strictly (whitelists over blacklists), normalize before checks, and enforce types and sizes. Use framework security features instead of writing your own. Least privilege: minimize DB, filesystem, and network permissions. Secrets management: use environment variables or secret stores, never hardcode. Dependency hygiene: pin and audit dependencies with pip-audit or Safety. Secure HTTP headers: add HSTS, X-Frame-Options, CSP, and others. Logging & monitoring: log relevant events, but never credentials. Testing: integrate Bandit and Semgrep in CI. 2. Preventing SQL Injection (SQLi) Principle: Never build queries using string concatenation. ...

Content Security Policy (CSP) is a security measure that helps protect web applications from various attacks, including Cross-Site Scripting (XSS) and data injection. CSP works by specifying a set of Content Security Rules that dictate what resources are allowed to load on a page. This can be used to whitelist trusted sources of content, or to block untrusted content entirely. One advantage of Content Security Policy is that it can help to prevent malicious code from running on a page. This is because CSP blocks resources from loading unless they are explicitly allowed by the Content Security Rules. As a result, CSP can act as a barrier against XSS attacks and other types of malicious code injection. ...