Microsoft Confirms September Security Update Breaks Excel Copy and Paste
Summary
Microsoft says the September 2026 KB5002914 security update can silently disrupt copy and paste, autofill, and formula dragging in Excel 2016–2024. Microsoft is investigating; uninstalling the update has restored functionality for some users.
Key points
- Microsoft confirmed KB5002914 can cause Excel copy-and-paste actions to fail silently.
- Autofill and formula dragging may also be affected.
- Affected versions include Excel 2016, 2019, 2021, and 2024.
- Microsoft says users may receive no error message or other indication when an operation fails.
- Microsoft is investigating the issue and has not yet announced a fix.
- Some affected users report that uninstalling KB5002914 restores functionality.
Article Details
- Event Type
- Software update regression
- Impact
- Microsoft confirmed that the September 2026 KB5002914 security update can silently disrupt copy and paste, autofill, and formula dragging in Excel 2024, 2021, 2019, and 2016. Users receive no error indication. Some affected users reported that uninstalling the update restored functionality; Microsoft is investigating.
Vendors
Products
Microsoft ExcelMicrosoft has confirmed that the September 2026 KB5002914 security update can silently break copy and paste, autofill, and formula dragging in Microsoft Excel for some users.Microsoft Hyper-VOn Monday, it also released emergency out-of-band updates to resolve Remote Desktop Services failures caused by the September 2026 security updates, along with Hyper-V and USB audio problems on some Windows versions.Microsoft OfficeIn July, Microsoft also fixed an issue that was preventing third-party applications from launching Word, Excel, PowerPoint, Access, and other Microsoft Office apps or opening documents on up-to-date Windows systems.Microsoft WindowsIn July, Microsoft also fixed an issue that was preventing third-party applications from launching Word, Excel, PowerPoint, Access, and other Microsoft Office apps or opening documents on up-to-date Windows systems.Remote Desktop ServicesOn Monday, it also released emergency out-of-band updates to resolve Remote Desktop Services failures caused by the September 2026 security updates, along with Hyper-V and USB audio problems on some Windows versions.