Its very hot and may damage your hardware
Until 70ºC is hot, but acceptable. 90ºC or more is just critical. Most CPUs won't reach 100ºC, they shutdown automatically before that.
To-do list
- Check if it varies with CPU percentual usage (e.g. How much temperature it gets when using 0% cpu?), or if its not related to. If that do not varies, may indicate your sensors are bad.
- Check air stream: if it can flow inside and outside your pc box, and if everything is clean, incluids your cooler.
- Test it in a cooler enviroment: test in a room with cool air conditionair or cool motherboard directly with a fan or ventilator. If temperature gets lower, that indicates bad thermal paste or cooler, replace them.
EDIT 1
"Hight temperatures does not damage your cpu"
Yes, it does damage, I didnt mean cpu dies imediatelly, but making it constant makes your cpu to die so much faster