CWE-269: Improper Privilege Management

def makeNewUserDir(username):
                        if invalidUsername(username):
                              
                                 
                                 #avoid CWE-22 and CWE-78
                                 print('Usernames cannot contain invalid characters')return False
                           
                           try:raisePrivileges()os.mkdir('/home/' + username)lowerPrivileges()
                           except OSError:print('Unable to create new user directory for user:' + username)return False
                           return True

seteuid(0);
                     /* do some stuff */
                     
                     seteuid(getuid());

AccessController.doPrivileged(new PrivilegedAction() {
                        public Object run() {
                                 // privileged code goes here, for example:
                                 System.loadLibrary("awt");return null;
                                 // nothing to return
                                 
                           }

public enum Roles {ADMIN,USER,GUEST}
                     public void printDebugInfo(User requestingUser){
                        if(isAuthenticated(requestingUser)){
                              switch(requestingUser.role){
                                    case GUEST:System.out.println("You are not authorized to perform this command");break;
                                       default:System.out.println(currentDebugState());break;
                                    
                                 }
                           }else{System.out.println("You must be logged in to perform this command");}
                     }