Wooden cabinet - Large crack
Bad split but great situation, in being a cabinet &amp; not a bank of drawers. However, I can't see fresh wood, which is quite odd. It's best to do this with the piece laying face-up on the floor.

You need to wood glue that. Open &amp; prop up the split to then squirt, popsicle stick or brush a thin layer of glue on the bottom of the split. Just get as much of the split as you can manage, remove your prop &amp; let gravity close it.

It shouldn't slide around &amp; should align perfectly on its own, but help it if needed. Wipe any glue off that squeezes out with a rung-out paper towel, rag or sponge. Keep the door open &amp; stack as much weight (up to 100-lbs) as you can within the cabinet door zone.

Start stacking with something long &amp; fairly thin to span the cabinet opening, so you can wipe off any additional glue squeeze out on both sides. And, let it sit for 27-hours. You should be good to go from there, but you can also install a small (1/2-inch x 1 1/2-inch) flat drilled piece of metal (at any hardware store) to bridge &amp; brace the old split, just under the drawer so it's not visible.