UPDATES 2019!

[Everyone]

TBH at this point I think a complete rewrite would be in order, keeping just the UI, and rebuilding all that unsafe PHP-mixed-with-HTML on a CodeIgniter shell with a templating language (eg. Twig, Handlebars), and also dropping support for PHP5.4-.

You know, the CodeIgniter base weights almost the size of the current GS CMS. I'm not sure if a framework is actually needed at all. I'd be downright against using Twig or any kind templating language. PHP already is a templating language. I don't see any benefits in introducing another abstraction layer with its own language, resource hog and bloat.

There's no need to rewrite anything, there are already thousands of other wonderfully realized projects waiting to be discovered

Honestly I wouldn't be here if there was at least one that would work for me. All I see nowadays is random crap taken from Packaginst and glued-together with composer, with mandatory Twig and Markdown; the final product weighing somewhere around 50 megabytes and still missing important features or just being a pain to use.

Correct me if I am wrong here

GS 3.3.15

1) has not been hacked before
2) is compatible with PHP 7.x
3) all mvlcek's plugins are working correctly

Please confirm

1. I doubt there's any data on that. Truth to be told, I hardly see any human-made attempts at cracking. What I see a lot is massively automated attempts directed at most popular platforms, most of them trying to guess weak passwords or access incautiously left setup scripts.
   
2. It depends on what you perceive as "compatible". Does it run? - Yes. Does it throw warnings/notices/deprication info? - Yes.
   
3. Same as 2.