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That's what happens when water gets into the front of the car.
The three most likely sources are that water leaks from the windscreen, sometimes down the outer side sunroof drain tubes, and the bonnet / hood spring pockets into the front foot wells.
If water settles on a little bucket-like ledge on the side of the bulkhead on the outer side of the foot well it eventually leaks into the sills.
Water travels along the whole length of the sill and usually makes its way into the section close to the front mounts of the rear suspension sub frame too so check there.
The joint between the sill and the floor pan is spot welded - this joint by the very nature of the construction is unprotected - no seam sealer here! So rot takes hold quite quickly.
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