\[ \text{The CMS experiment at the LHC has reported new discoveries in flavor spectroscopy. In this talk, the observation of } \Xi_b(6100)^- \text{ baryon, the decay } \Lambda_0^b \rightarrow J/\psi \Xi^- K^+, \text{ the first observation of } \eta \rightarrow \mu^+ \mu^- \mu^+ \mu^- \text{ decay, and exotic resonances near the } J/\psi J/\psi \text{ threshold are presented. All these results use the CMS data collected in proton-proton collisions at 13 TeV.} \]