The problem is in getting the file sharing by Mime

[demortx]

CodeIgniter4/system/HTTP/Files/UploadedFile.php

Line 363 in 84b9cc7

return Mimes::guessExtensionFromType($this->getClientMimeType(), $this->getClientExtension()) ?? $this->getClientExtension();

I’m definitely not sure, but I ran into a problem, when downloading a file it doesn’t determine the exact extension by Mime, in my code, an error was made in the Mime source in the code.

If so, let me know I will fix it.

Now you can upload any file simply by changing the extension from .php to .png and the validator will not notice

Fix?
return Mimes::guessExtensionFromType($this->getMimeType(), $.....

[MGatner]

Since actual MIME type detection is imperfect I think the choice was to go with the extension since it is a simpler and more predictable solution. I'll see if @lonnieezell has anything else to say.