Microsoft Excel users report that this week’s KB5002914 Office security update is breaking copy-and-paste operations and formula dragging, with affected users saying that removing or rolling back the update restores normal functionality.

Microsoft released the security update this week as part of its September 2026 Patch Tuesday, and reports of the problem soon appeared on both Reddit and the Microsoft Q&A forums.

“It seems that security update kb5002914 might have bricked autofill and copy paste in Excel 2016,” a Reddit user reported.