Which cranial nerve is involved in the secretion of saliva?

CN VII (facial)

The cranial nerves that regulate salivation are CN VII (facial) and CN IX (Glossopharyngeal).

The cranial nerves that transmit the special sense of taste are CN VII (facial, to the anterior 2/3rd of the tongue) and CN X (vagus, to the posterior 1/3rd of the tongue).

Of these nerves, only CN VII (facial) transmits both taste and salivation control.