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Application Security

Cyberattacks Don't Break Into Your Network. They Walk Through Your Application.

This is where you learn how application-layer attacks work — and how to build software that doesn’t hand attackers an open door.
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Start With Basics

Securing the Software Your Business and Users Depend On Every Day

Application security is the practice of finding, fixing, and preventing vulnerabilities in the software you build, buy, and deploy.

3 Pillars of Application Security

  • Secure Development Building security into code from the first line, not bolting it on before launch.
  • Vulnerability Testing Finding weaknesses in the application through automated scanning and manual testing.
  • Runtime Protection Monitoring and defending applications while they are live and actively being used.

Three Reasons Applications Get Compromised

Security Treated as a Pre-Launch Checklist

If you only evaluate security at the end of development, vulnerabilities have already been baked into the design.

Broken Authentication Giving Attackers Easy Access

Weak session management, missing MFA, insecure password resets, and broken authentication consistently rank among the top causes of application breaches.

APIs Exposing More Data Than They Should

Excessive data exposure, missing authorization checks, and unauthenticated endpoints make APIs one of the most actively targeted attack surfaces in application security today.

The Real Cost of Insecure Applications

0 billion

Records originated from application attack surfaces in the top 10 application attacks.

0 %
Spike in exploited software vulnerabilities alongside a 61% surge in newly discovered vulnerabilities
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Major application code changes never undergo a full security review before being deployed to production.
0 %
Of all breaches started with vulnerability exploitation as the initial access method

The Core Vocabulary of Application Security

OWASP Top 10

The globally recognized standard listing the ten most critical web application security risks is the baseline reference for every application security program.

SQL Injection

Injection occurs when an attacker manipulates database queries, and it is one of the oldest and most consistently abused application vulnerabilities.

Broken Authentication

Vulnerabilities in login, session management, and credential handling that let an attacker take over an account without having to break passwords.

API Security

The controls governing how APIs authenticate, authorize, and expose data APIs are now the most actively targeted application attack surface.

SAST & DAST

Static and dynamic application security testing automated approaches to finding vulnerabilities in code before and during runtime.

Secure SDLC

Practice of security integration, with security reviews, testing, and checks at every phase of the software development lifecycle.

Go Deep on What Matters to You.

From understanding the most common vulnerabilities to building a secure development program from scratch.

Why US

  • Practitioner-Reviewed Verified by active application security engineers and developers
  • Zero Vendor Influence No paid tool recommendations. Ever.
  • Depth Over Headlines We explain how, not just what, happened
  • Regularly Updated Refreshed as OWASP standards and vulnerability trends evolve
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Application Security Guides Every Weekend.

One email. The week’s most useful AppSec breakdowns, vulnerability walkthroughs, and secure development how-tos written for engineers.