Do I need to replace this wall that is on the outside of my flat? Panic

I'd just let it dry out a bit then

1- Treat wood with some wet rot wood hardener.
2- Any wood from the window that's now missing - fill out with 2-part wood filler and sand back to shape.
3- Get some quick dry cement and make good around the window area.
4 - When all dried prime window
5 - seal area where window frame meets the wall with external sealant.
6 - Paint window frame.
7 - leave wall to really dry out month or two before priming and painting in case of any salts wanting to get out.

Apparently the wood around the window is MDF which isn't waterproof so assuming this will need to be replaced (if not by me then by someone else)
 
The Mdf could always be external mdf. Not sure how you would tell tbh. Either way would require drying, resealing and could use an external filler maybe.

Without ripping it all out it's always gonna be a bodge of sorts.
 
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