Measurements of diboson production in proton-proton collisions at the LHC, performed by the CMS Collaboration, are summarized. We report studies of $\mathrm{ZZ}$ production at $\sqrt{s} = 13$ TeV, $\mathrm{WZ}$ production at $\sqrt{s} = 8$ and $13$ TeV, $\mathrm{WV} \to \ell\nu \mathrm{q}\bar{\mathrm{q}}$ ($\mathrm{V} = \mathrm{W}^\pm$ or $\mathrm{Z}$, $\ell = \mathrm{e}$ or $\mu$) at $\sqrt{s} = 8$ and $13$ TeV, and $\mathrm{Z}\gamma \to \nu\bar{\nu}\gamma$ at $\sqrt{s} = 13$ TeV. Inclusive and differential cross section measurements and limits on anomalous triple gauge couplings are reported, as well as a measurement of the $\mathrm{Z} \to 4\ell$ branching fraction.