A Server-Side Template Injection (SSTI) flaw exists in the MDX Rendering Engine of Mintlify Platform. This issue allows remote attackers to execute arbitrary code through inline JSX expressions within an MDX file. The vulnerability is related to the processing of MDX files and the rendering of JSX expressions. SSTI occurs when user-supplied input is incorporated into a server-side template without proper sanitization, allowing an attacker to inject malicious code that is then executed by the server.