GoKawiilMicrosoft acknowledges KB5002914 update breaks Excel copy-paste and autofill
Microsoft has confirmed a bug in its September 2026 KB5002914 security update causes copy-paste, autofill, and formula dragging to silently fail in Excel 2016, 2019, 2021, and 2024. The issue produces no error message or warning, leaving users unaware that their paste actions did not take effect. Microsoft says it is investigating but has not yet issued a fix, though affected users can uninstall the update via command-line instructions to restore normal functionality.
GoKawiil's interpretation of the reporting above, not reported fact.
Silent failures are particularly disruptive in spreadsheet work, where copy-paste errors can go unnoticed and corrupt data or calculations without any warning sign. The bug affects multiple Excel versions across the perpetual license lineup, meaning enterprise and individual users alike relying on Patch Tuesday updates for security are forced to choose between staying protected and keeping core functionality intact.
- KB5002914, part of September 2026 Patch Tuesday, breaks copy-paste, autofill, and formula dragging in Excel 2016-2024.
- The failure happens silently, with no error message alerting users that their paste action failed.
- Microsoft has not released a fix yet; a manual uninstall via Command Prompt is the current workaround.
Source: bleepingcomputer.com, 2026-09-15
Published there as: “Microsoft confirms KB5002914 Excel update breaks copy and paste”
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