Security guides your team can ship this week

Based on ZeriFlow scan data across thousands of websites, the average security score sits at 61/100 in 2026. Most sites fail the same five checks. Most sites can gain 15-20 points with a single afternoon of work. Here is what the data shows.

Most SaaS security incidents are not caused by sophisticated attacks — they stem from deferred basics. This 30-item checklist organizes web application security by category and urgency, giving founders and developers a clear implementation sequence.

The Permissions-Policy header gives you fine-grained control over which browser APIs your pages and embedded content can access. It replaced the deprecated Feature-Policy header and is now a critical privacy and security control for any modern web application.

The Referer header silently leaks URL fragments, session tokens, and user paths to third parties on every navigation. The Referrer-Policy header gives you precise control over what gets shared — and most sites are using the wrong setting.

Security misconfiguration is the most prevalent vulnerability class in OWASP's Top 10, affecting 90% of tested applications. This guide covers the 10 most damaging misconfigurations, with real detection and remediation steps for each.

GDPR is not just a legal document — Article 32 mandates concrete technical security measures that fall squarely on development teams. This guide translates the regulation into actionable implementation steps for developers and SaaS founders.

A subdomain takeover lets an attacker serve content from your domain by claiming an abandoned cloud resource. This guide explains the mechanics, shows real-world examples, and gives you a concrete remediation and monitoring workflow.

SQL injection remains the most damaging injection class in web applications. This guide covers how SQLi works, parameterized queries in Node.js and Python, ORM pitfalls, and how to verify your defenses with automated testing.

Cross-site scripting remains one of the most exploited vulnerabilities on the web. This guide covers all three XSS variants, vulnerable vs. secure code patterns, CSP as a second line of defense, and practical testing workflows.