i dowloaded Codex executor and found ScreenGui in CoreGui named “Codex”
Exploiting is against Roblox Terms Of Service, you just publicly stating you downloaded a script executor (most likely malware btw) could get your account terminated:
Also, there is no guaranteed way to protect the CoreGui. Exploits can realistically do whatever they want to their client, and that includes modifying the CoreGui.
Awful take, hundreds of developers exploit their own games in an effort to find vulnerabilities since ROBLOX doesn’t do anything fast enough to fix them.
Unfortunately, CoreGui is hidden from any modification/usage on the developers side. Yes, exploit/exec programs can get to it but we have no real/efficient way to prevent this from happening as of yet.