In 2025, broken access control remains the leading web application vulnerability, affecting 94% of applications and incurring average breach costs of $4.44 million. Custom Role-Based Access Control (RBAC) implementations in Next.js applications are costly and time-consuming, requiring 150-300 developer hours, while introducing significant security risks. Modern solutions like Clerk offer component-first approaches that enable secure multi-tenant authorization in less than 30 minutes, transforming the economics of building secure B2B SaaS applications. Critical vulnerabilities, such as CVE-2025-29927, highlight the risks inherent in Next.js middleware, which attackers can exploit to bypass authentication. To mitigate these vulnerabilities, organizations must upgrade to patched versions, validate all requests, and block or strip vulnerable headers at the edge. The document emphasizes the importance of adopting modern authorization platforms to handle complex organizational hierarchies, maintain compliance, and protect against evolving threats, such as AI-powered authentication attacks and quantum computing, while focusing engineering resources on core product features rather than rebuilding established solutions.