Client-Side Security Enforcement Bypass Risks

CWE-602 represents a critical architectural flaw where applications enforce security controls exclusively on the client side rather than validating them server-side. This vulnerability allows attackers to bypass authentication, authorization, and data validation mechanisms by manipulating client-side code, intercepting requests, or replaying modified transactions. Organizations across all sectors are affected, particularly those handling sensitive data or financial transactions. The CVSS 9.1 rating underscores the severe impact: attackers can gain unauthorized access, exfiltrate data, or modify transactions without server-side verification.

Casky.ai's security skills leverage Claude's extended reasoning to identify client-side enforcement patterns that indicate exploitable gaps. While this specific CVE doesn't map to discrete MITRE ATT&CK techniques, practitioners using Casky would detect related attack patterns across T1110 (Brute Force), T1556 (Modify Authentication Process), and T1040 (Traffic Redirection) through code analysis and behavioral detection. Security teams would observe findings highlighting missing server-side validation, weak session management, or unencrypted sensitive operations in network traffic. By mapping 754 security skills against application architectures, Casky helps practitioners identify where client-side controls exist without compensating server-side validation—enabling remediation before exploitation.