The Foals, who also hit the woodwork and have now won seven of their last eight matches, were left with 10 men when Bensebaini was sent off with a second booking in the 87th before Leonardo Bittencourt got a stoppage-time goal for the visitors.
Gladbach earlier had Christoph Kramer and Laszlo Benes taken off injured, the latter with what looked like a serious ankle injury.
Gladbach lead the title race on 25 points, with RB Leipzig in second place on 21. Champions Bayern Munich crushed Borussia Dortmund 4-0 on Saturday to move up to third, also on 21. (Reporting by Karolos Grohmann, editing by Pritha Sarkar)