The issue is related to the `CompiledRule::validateExpression` method, which evaluates an SpEL expression using a `StandardEvaluationContext`. This allows the expression to interact with Java classes, such as `java.lang.Runtime`, leading to Remote Code Execution. The `/api/v1/policies/validation/condition/<expression>` endpoint passes user-controlled data to `CompiledRule::validateExpression`, enabling authenticated non-admin users to execute arbitrary system commands on the underlying operating system. A missing authorization check, as `Authorizer.authorize()` is never called in the affected path, allows any authenticated non-admin user to trigger this endpoint and evaluate arbitrary SpEL expressions, leading to arbitrary command execution.