Microsoft Excel Security Update KB5002914 Breaks Copy-Paste and AutoFill
A critical security patch released on September 8 has rendered core productivity features unusable for some Excel users.
A recent Microsoft Office security update has triggered widespread failures of essential tools in Microsoft Excel, leaving many users unable to perform basic data manipulation. The issue, linked to update KB5002914 released on September 8, 2026, has disrupted the software's most fundamental productivity workflows.
According to reports from BleepingComputer and BornCity, the update has broken copy-and-paste operations and the AutoFill feature. Affected users report an inability to copy cells or drag formulas across a spreadsheet. In several instances, the software has crashed entirely, with users encountering access violation errors (0xc0000005). The bug is not limited to a single version; confirmed affected installations include Excel 2016 (MSI), Office 2019, Office 2021 LTSC Pro, and Office 2024 LTSC Pro.
Security vs. Stability
The problematic update was part of a broader batch of security fixes designed to protect users from several remote code execution (RCE) and information disclosure vulnerabilities. Notably, the patch included fixes for the Office 2016 MSI version, which has already reached its end-of-support phase. While the update was intended to close critical security holes, the resulting instability has created a conflict for IT administrators and end users.
Impact on Productivity
Because copy-and-paste and AutoFill are the primary mechanisms for data analysis and spreadsheet management, their failure renders Excel nearly unusable for professional workloads. This creates a precarious trade-off: users must either remain vulnerable to the security threats the patch was meant to solve or lose the ability to use the software's core functionality. For many, the loss of these features is a complete blocker for daily operations.
Current Workarounds
There is currently no official patch from Microsoft to resolve the regression. However, users have found that rolling back the KB5002914 update restores full functionality. For those using MSI-based installations, uninstalling the specific update has proven effective in bringing back copy-paste and AutoFill capabilities. Users are advised to monitor official Microsoft channels for a permanent fix while weighing the risks of remaining unpatched against the need for software stability.