It sounds like a black hat penetration tester's nirvana. All you have to do is open the right issue to trick the model into installing the right security vulnerability or backdoor, or better yet, a series of small security vulnerabilities that can be chained to create a tailor-made exploit. It's practically a hacker's choose-your-own adventure.
I suspect they'd be manually filtering which issues/features their agents attempt to fix/implement. Otherwise you end up with all sorts of features that simply make no sense for the project.
The approach is at least better than accepting slop PRs that could have backdoors injected into them.
That seems a lot harder than if they accepted PRs like everyone else
I am not sure about that.
Which gate is easier to maintain?
1. Check issues for malicious intent
2. Check PR for malicious intent.
I think in PR requests it is easier to introduce purposeful bugs or obfuscated code than it is to hide them in issues.
So I think gating on issues is easier and more secure.