Web security breaches cost Indian businesses an average of ₹17.9 crore per incident in 2025, according to IBM's Cost of a Data Breach report. The vast majority of successful attacks exploit known, preventable vulnerabilities. This guide covers the most impactful security practices every web application should have in place by 2026.
Authentication and Session Security
Implement authentication correctly using established libraries — never roll your own crypto. Use passkeys or TOTP-based multi-factor authentication for anything beyond casual accounts. Store passwords using Argon2id or bcrypt with a cost factor calibrated to your server hardware. Set session cookies with HttpOnly, Secure, and SameSite=Strict attributes. Rotate session tokens after privilege escalation events (login, password change, role change).
Content Security Policy and Header Hardening
A well-configured Content Security Policy (CSP) prevents XSS attacks by restricting which scripts can execute on your pages. Pair it with other security headers: Strict-Transport-Security (HSTS) forces HTTPS, X-Frame-Options prevents clickjacking, and Permissions-Policy restricts access to browser APIs. Use Mozilla Observatory or securityheaders.com to audit your current headers and identify gaps.
Dependency Management and Supply Chain Security
The single most underappreciated attack vector in modern web applications is third-party dependencies. Run npm audit or equivalent weekly. Pin your dependencies to exact versions in CI. Use tools like Socket.dev or Snyk to monitor for newly discovered vulnerabilities. In 2025, supply chain attacks accounted for over 23% of incidents affecting web applications.
Data Handling and Privacy
Encrypt sensitive data at rest using AES-256 and in transit using TLS 1.3. Apply the principle of least privilege to database accounts — your web app should not connect to the database as a superuser. Log access to sensitive data and set up alerts for anomalous patterns. Under India's Digital Personal Data Protection Act (DPDPA), maintaining proper data handling records is also now a legal requirement.
— Conclusion
Security is not a one-time checklist — it is an ongoing discipline. The businesses that get breached are not those with zero security investment; they are those who deploy security measures once and never revisit them. CodoHub builds security into every layer of our projects and offers security audits for existing applications. Contact us to schedule a security review.