Since the "backend" sounds like a one page form with five inputs I don't see the need for an "admin panel" on the webserver at all (let alone Lavarel). As it's described in the OP you could do it with an offline page, or just a one line GET request.
Code:
https://example.com/script.php?title=My+title&permalink=link&desc=Description&tags=tag1,tag2,tag3&video_code=whatever+this+is&token=somekindofsecuretoken
I fully support the ideology of minimalism in web design, only having features you need/use and avoiding bloat, but would only recommend it if you can truly DIY (that its, not rely on assorted randos of unknown competence or malice).
Anyone who can't or doesn't want to DIY should simply use tried and tested existing scripts.
I'm no fan of Wordpress due to its size, but it would not be running 30% of the entire internet if it was inherently insecure. The main reason people get hit is because they use out of date/unpatched versions of the core software, plugins or themes, pick insecure passwords or don't change the location of the admin page.
Anyway, don't stop believin', OP.
