OWASP Top 10 (2021) for Regulated Industry Applications

The OWASP Top 10 2021 represents the most critical web application security risks as assessed by the OWASP community, updated from the 2017 edition. The 2021 list introduces three new categories: A04 Insecure Design (emphasizing threat modeling and secure design patterns), A08 Software and Data Integrity Failures (covering CI/CD pipeline security and insecure deserialization), and A10 Server-Side Request Forgery (SSRF). Three categories were renamed and expanded: A01 Broken Access Control (merged from multiple 2017 entries, now the top risk) includes IDOR and privilege escalation; A02 Cryptographic Failures (renamed from Sensitive Data Exposure) focuses on the underlying cryptographic cause; A03 Injection now includes XSS alongside SQL injection. The OWASP Top 10 is explicitly referenced in PCI DSS v4.0 Requirement 6.2.4 and 6.3, and is the foundational checklist for application security testing under DORA, FFIEC, and NHS DSP Toolkit.

For regulated industries, each OWASP Top 10 category maps to specific regulatory obligations. A01 Broken Access Control corresponds to HIPAA §164.312(a) access control and PCI DSS Requirement 7 (restrict access to system components and cardholder data). A02 Cryptographic Failures maps to PCI DSS Requirement 4 (protect cardholder data in transit) and HIPAA §164.312(e)(2)(ii) (encryption and decryption). A03 Injection — specifically SQL injection — is the top technique for exfiltrating PII and financial records and directly implicates GDPR Article 32 (appropriate technical measures). A07 Identification and Authentication Failures covers session management weaknesses that enable account takeover in banking and healthcare portals. Testing for OWASP Top 10 must be documented in the application security testing program under PCI DSS 6.3.2 and DORA ICT risk management requirements.

A04 Insecure Design deserves particular attention in regulated environments because it requires remediation at the architecture level, not the code level. OWASP defines insecure design as the absence of security controls that are necessary by design — for example, a financial application that allows unlimited failed authentication attempts without account lockout, or a healthcare application that does not enforce data minimization at the API response layer. Detecting insecure design requires threat modeling (STRIDE or PASTA methodology) as part of the SDLC design phase. A08 Software and Data Integrity Failures has direct relevance to CI/CD pipeline security in regulated DevOps environments: the SolarWinds supply chain attack and Log4Shell exploitation paths are both examples of this category. SLSA (Supply-chain Levels for Software Artifacts) framework and NIST SP 800-218 SSDF provide engineering controls for A08.

We embed OWASP Top 10 2021 controls into client SDLC processes through threat modeling integration, automated SAST/DAST tooling configured to detect all 10 categories, and developer training programs. Our assessment deliverables map findings to specific OWASP Top 10 categories cross-referenced with applicable regulatory requirements, supporting both remediation prioritization and audit evidence.

Compliance-Native Architecture Guide

Design principles and a structured checklist for building software that is compliant by default — not compliant by retrofit. Covers data architecture, access controls, audit trails, and vendor due diligence.