My mind immediately went to chaining this with another recent vulnerability in the Ninja Forms - File Upload plugin [0]
> This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
So, upload and execute a script that loads Copy Fail and even if you're only executing as www-data or another restricted user that "can't" sudo -- suddenly, uid=0!
Yes but what I'm saying is that copy.fail is a minor detail in this scenario.
If you are running Ninja Forums you need to run it in its own VM so that if it gets compromised _you don't care if it has uid=0_.
You need to do that regardless of copy.fail. Now that you've patched copy.fail, there are loads and loads of other vulns that can be used the same way.
> This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
So, upload and execute a script that loads Copy Fail and even if you're only executing as www-data or another restricted user that "can't" sudo -- suddenly, uid=0!
To repeat the refrain... I'm so tired.
[0] https://www.wordfence.com/blog/2026/04/attackers-actively-ex...