Yes, CURSOR is a Scrabble word!

Letter values in Scrabble US: C 3, U 1, R 1, S 1, O 1, R 1.

Is it a valid word?

CURSOR is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

(computer science) indicator consisting of a movable spot of light (an icon) on a visual display; moving it allows the user to point to commands or screen positions