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Microsoft Confirms Excel Paste Bug After September Security Update

Microsoft Confirms Excel Paste Bug After September Security Update

First seen 15 Sep 2026, 06:55 UTC

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ThreatCluster AI
ThreatCluster September 15, 2026 at 08:21 UTC
  • Excel paste function fails silently after September 8 update KB5002914.
  • Affected versions include Excel 2016, 2019, 2021, and 2024; Microsoft 365 users appear safe.
  • No timeline for a fix has been announced; temporary workaround available.

Following the September 8 security update KB5002914, Microsoft Excel users are experiencing a critical bug where the paste function fails silently, leaving source cells selected and destination cells empty. Affected versions include Excel 2016, 2019, 2021, and 2024, with reports of additional issues such as non-functional fill handles and crashing. Microsoft has acknowledged the problem but has not provided a timeline for a fix. Users of Microsoft 365 appear to be unaffected, but some reports suggest isolated clipboard errors. A temporary workaround involves using Paste Special to paste values. The issue has been confirmed by Microsoft in their update description, and users are advised to uninstall the update if necessary.

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Timeline

2026-09-08
KB5002914 update released
Microsoft released a security update for Office, which introduced a bug affecting Excel's paste function.
Notebookcheck
2026-09-10
Microsoft acknowledges the bug
Microsoft confirmed the paste function failure and added it to the update description as a known issue.
Notebookcheck
2026-09-15
Betanews reports on acknowledgment
Betanews published an article confirming Microsoft's acknowledgment of the copy and paste problems in Excel.
Betanews

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