Forest took the lead on the night but found themselves behind at the break after two late first-half goals.
But the games’ main talking point came in the final moments as Grabban backed into Boro shot-stopper Arnsley Pears and with a delicate flick of his heel was able to force the ball over the line.
And it was an ex-Stoke City man who stopped Forest from winning the game as Ryan Shotton, Fenton-born, blocked a goalbound Adama Diakhaby shot late into stoppage time.
“It’s not a free kick, I must say,” said Keith Andrews on Sky Sports’ co-commentary.
“It’s really inventive. He backs in but he is clever. He treats it like the ‘keeper is a centre-half.
“That is not a free-kick and it is quite a delightful touch to finish. Very clever centre-forward play from Lewis Grabban.”
The result means that Middlesbrough still remain without a win since New Years’ Day but creep one step closer to the Potters.
Michael O’Neill’s side are now just a point ahead of their relegation rivals with the two clubs currently either side of the dotted line.