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.