A Web Application Firewall (WAF) is a security tool specifically designed to filter, monitor, and block malicious HTTP traffic aimed at a web application — protecting against threats like SQL injection, cross-site scripting, and other common attack patterns before they ever reach the actual site.
How a WAF Differs from a Standard Firewall
- A standard network firewall filters general traffic at the network level
- A WAF specifically understands and inspects web application traffic and HTTP requests
- A WAF can detect attack patterns unique and specific to how websites actually work
What a WAF Typically Protects Against
- SQL injection attempts targeting a site's database
- Cross-site scripting (XSS) attacks
- Distributed denial-of-service (DDoS) attacks
- Known malicious bots and automated scanning attempts
WAF Options for WordPress
- Cloudflare — offers WAF protection at the network level, before traffic even reaches your server
- Sucuri — a well-regarded security plugin with built-in WAF capability
- Wordfence — includes a WAF as part of its broader security plugin
For any site handling sensitive user data, or any business genuinely worried about targeted attacks, a WAF adds a meaningful, proactive layer of protection well beyond WordPress's own default security measures.
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