Aaagghh water stain on my lovely oak furniture! What to do?

[Wapawapa]

As the title suggests, I have just realized that the vase I have had there for the last week has been leaking ! Dirty black stain right in the middle of my lovely new furniture
What can I do??!!

Mayonnaise? Although I’d try it on a tiny bit first. Good luck
www.bobvila.com/articles/how-to-remove-water-stains-from-wood/

I’ve had luck before using the iron/hairdryer method to dry out the water trapped under the varnish but follow the instructions correctly (google).