Which cooler ?
Tjmax temperature at which slowdown may occur is 95c so 85c at full load on all cores is quite acceptable.
Idle temps at 50-60c are indicative of sub optimal cooling but typical for SFF cases. They are also subject to how "idle" is your Idle, anything above 1% CPU usage is not really idle.
it's not that bad, the sff pc's will run hotter because less airflow, if it's used and wasn't a refurb you can probably get it a few degrees cooler if you clean the dust out and re-paste it, but I wouldn't worry unless it was being maxed out all the time