
Security is an element of web application development that is often overlooked. Business websites and applications need to be accessible and easy to use, and that openness brings a wide range of security challenges. These are practical ways to improve the security of your web applications.
Use HTTPS (TLS) on every page, not only the login page. It encrypts data such as login credentials and payment details in transit, so anyone who intercepts the traffic cannot read it. Disable old protocol versions and add the HSTS header so browsers always use HTTPS.
Take proactive steps to uncover weaknesses before attackers do. Use a web application scanner to test the application itself for issues such as injection and broken access control, and a network vulnerability scanner for server-level issues such as open ports, unpatched systems and insecure configurations. Scan on a regular schedule and after every significant change.
Keep regular backups of your site files and databases in case the site becomes unavailable or data is lost. Your hosting provider may back up its servers, but you should keep your own backups too, store them separately, and test that you can restore from them.
Every plugin, database and application on your site is another possible point of entry. Remove files, plugins and databases that are no longer in use, and keep your file structure organised so changes are easy to track.
Attackers actively target known security flaws in popular web software. Apply updates for your platform, plugins and libraries promptly, and remove software that is no longer maintained.
Finally, run security scans as a routine part of releasing and operating your site, and fix what they find.
Get visibility: scan your applications, fix the Critical and High findings, then make testing continuous.
Track open findings by severity over time, and retest fixes to confirm them.
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Related: Adding DAST to your CI/CD pipeline · Keeping third-party components up to date