Web Security Testing: OWASP Top 10 Vulnerability Guide for QA Engineers

1. The Role of QA in Application Security (AppSec)

• A01: Broken Access Control: Unauthorized vertical or horizontal privilege escalation (e.g., IDOR vulnerabilities).
• A02: Cryptographic Failures: Insecure transmission or storage of sensitive customer credentials and payment tokens.
• A03: Injection Flaws: Unsanitized user inputs evaluated as executable commands (SQLi, NoSQLi, Command Injection).
• A04: Insecure Design: Flaws in architecture allowing credential stuffing or unlimited brute-force attempts.
• A05: Security Misconfiguration: Default administrative credentials, enabled debug headers, or misconfigured CORS policies.

2. Practical Security Testing Payloads for QA

-- Basic SQL Injection authentication bypass payload
admin' OR '1'='1' --

-- Cross-Site Scripting (Reflected & Stored XSS) test vectors
<script>alert('QA_Security_Vulnerability')</script>
<img src="x" onerror="alert(document.domain)">

3. Essential Free Security Testing Toolkit

• OWASP ZAP (Zed Attack Proxy): Automated dynamic application security testing (DAST).
• Burp Suite Community Edition: Intercepting proxy for parameter tampering and session testing.
• Postman: Automated verification of security response headers (HSTS, CSP, X-Content-Type-Options).