Tromso hospital told AFP the man's life was not in danger and he was in a stable condition.
This worker is unidentified but is part of the ship's "Bear Watch Team" - an armed teamed trained to accompany the expedition leaders as they guide passengers on excursions. The first guard apparently did not see the bear, which then attacked him and injured him "on his head".
The polar bear was shot and killed after the attack, the report said.
The World Wildlife Fund lists polar bears as a vulnerable species.
If the guards had been successful in securing the land and there were no polar bears surrounding the site, tourists would have been permitted to disembark the ship to explore the land.
Hapag-Lloyd assured the landing was not for polar bear observation as guests are only allowed to view the wild animals on board and from a safe distance.
An estimated 60 percent of it is covered with ice, and its 3000 polar bears are said to outnumber the human population.
Spitsbergen is an Arctic archipelago located between mainland Norway and the North Pole. A port schedule at Longyearbyen in the region showed that 18 cruise ships will be docking at the Arctic port in the next week.
But critics online say the bear was only acting like a bear, and didn't deserve to die. "Usually there are also a few polar bears remaining in the area over the summer". In 2015, Czech Jakub Moravec was pulled out of the tent by a polar bear, but escaped with slight damage. "In an act of self-defense, unfortunately, it was necessary for the polar bear to be shot dead".
"They had no right to get themselves into a situation where they needed to defend themselves", said one Twitter user.