CWE-408 (不正确的行为次序：早期放大攻击) — Vulnerability Class 5

CWE-408 represents a logic flaw where a system executes resource-intensive operations prior to verifying user identity or permissions. This weakness is typically exploited by attackers who trigger these expensive processes, such as complex database queries or file uploads, using unauthenticated requests. By doing so, they aim to exhaust server resources, leading to denial-of-service conditions or significant performance degradation for legitimate users. Developers can prevent this vulnerability by strictly enforcing authentication and authorization checks before initiating any costly computational tasks. Implementing a secure middleware layer that validates credentials early in the request lifecycle ensures that only authorized entities can access expensive functionalities. Additionally, rate limiting and input validation should be applied at the earliest possible stage to mitigate the impact of malicious requests, thereby preserving system stability and ensuring fair resource allocation.