It is safe, no security issues.
But reaching the top is conditional. About two km before the top the road forks, straight for top and right for Thandiani village, then it further goes to Muzaffarabd, AJK. They use bulldozers to remove snow and ice from the Muzaffarabad road, but the last two kilometres to Thandiani top are not cleared unless some VIP is going there. If it hasn't been cleared after the last snowfall then cars usually can't reach the top.