Abstract: We present the most recent studies of multiboson production (not photon-induced) physics in proton-proton collisions at 13 TeV center-of-mass energy based on data recorded by the CMS detector at the LHC in 2016-2018. These include precise measurements of WW, WZ, ZZ and the first observation of tribosons (VVV) production. Results on dibosons production at 5.02 TeV center-of-mass energy are also presented using data collected by CMS in a special LHC run. Results include total and fiducial cross sections, as well as normalized differential cross sections in the fiducial region. These are compared to the most accurate theoretical predictions to the date. We also present the first observation of single longitudinally polarized W bosons in the WZ production.

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