Yikes. I'd probably toss it and send an email to Five Star asking for a replacement.
Okay, let's be honest. I'd probably put on some gloves, relocate it to some kind of container (a flip-top, maybe, after doing some research to see if concentrated Starsan reacts with glass), rinse the hell out of my hands and anything that may have contacted the concentrate, and then send an email to Five Star.
Either way, concentrated acids should never be allowed to leak. That sounds pretty dang dangerous.
Never had it leak through the bottom but about 50% of the time out one of the caps. Now as soon as i get it it goes in a glass liquid soap dispenser with a pump. The pump makes for easy dispensing.