Web application security, the practical guide.

Web application security is the practice of protecting the web-facing parts of your software, the browser app, the APIs behind it, the infrastructure those APIs run on, from attackers who want to read data they shouldn't, take actions they shouldn't, or knock the service offline. It covers everything observable from the outside (TLS, headers, cookies, CORS, DNS, email auth, network surface) and the code shipping into that surface (injection, secrets, broken access control, deserialization). It overlaps with infrastructure security but is distinct from it: a perfectly hardened cluster running an application with a missing CSP and a broken auth check is still wide open.

The work itself splits into three time horizons. Point-in-time checks: someone runs a scan or a pentest and produces a snapshot. Continuous monitoring: scheduled scans that catch drift on the next run. PR-level checks: SAST and dependency scans that catch issues before they merge. A working program uses all three, with most of the day-to-day weight on continuous monitoring because that's where misconfiguration drift actually shows up.

Across recent Barrion scans, almost every tested site is missing a strict Content Security Policy. A clear majority are missing modern Permissions-Policy directives, and a meaningful share still serve deprecated TLS versions or expose server-version banners that hand attackers a free reconnaissance step. None of this is exotic, and most of it is quick to fix. The reason it stays broken is that nobody runs the check until something forces them to, an enterprise customer's security questionnaire, an annual audit, or a public incident.

The cost of staying out of date isn't theoretical. Verizon's Data Breach Investigations Report has listed web application attacks among its main breach patterns for years. Real-world breach reports show the same handful of categories repeating: misconfigured access control, leaked secrets, outdated components, and broken authentication. The pattern's stable enough that you can build a useful program around catching exactly those categories early, which is what continuous monitoring is for.

We split coverage into two products because they answer different questions. A passive scan tells you what's exposed right now. An AI pentest tells you what an attacker could actually do with what's already there. Most teams start with the free scan, then run AI pentests continuously on a schedule or on demand, with passive monitoring watching for drift in between. Read what continuous pentesting is or how Barrion's AI pentesting works.

Most compliance frameworks ask for the same technical evidence in slightly different wording. Encryption in transit. Access control. Vulnerability management. Continuous monitoring. Audit logging. If you're already running the controls, the work is producing timestamped evidence for your auditor, and Barrion's exports give you that record. See the compliance hub for per-framework detail.

You don't need a kickoff meeting. Pick a production URL, run a scan, work the top five findings, and turn on monitoring. The whole sequence below takes most teams a week of part-time effort, and most of that week is spent on the actual remediation. The Barrion side of it is closer to an afternoon.

Browse the full set on the tools page, or read the blog for deeper write-ups on individual checks and recent findings from the production corpus.