Comment by WalterBright

Look I'm writing sdrawkcab (amazingly, I did it without using Unicode!). Layout is the job of your text formatting program. It's easy to fix a text editor to support right-to-left text entry.

The switch in text direction has resulted in malicious code injection attacks, as the reversed text becomes invisible. I had to change my compiler to reject those Unicode characters for that reason. It can be used in other cases to have hidden, malicious text.

Have you checked your SQL code for invisible backwards text that injects malware?