This proceeding covers fiducial Higgs boson cross section measurements and simplified template cross section measurements by the CMS collaboration. The report focuses on measurements in bosonic decay channels, namely $H\rightarrow\gamma\gamma$, $H\rightarrow ZZ\rightarrow4\ell$, and $H\rightarrow WW\rightarrow 2\ell2\nu$, and all measurements are performed using Run 2 data (2016-2018) at a centre of mass energy of 13 TeV. All results are found to be in agreement with the Standard Model of particle physics.