GoKawiilMicrosoft's KB5002914 patch breaks Excel copy-paste and autofill for some users
Users of multiple Excel versions, from Office 2016 through 2024 including LTSC 2021, report that this week's KB5002914 security update, part of Microsoft's September 2026 Patch Tuesday, disables copy-paste and formula-dragging functions. Complaints surfaced on Reddit and Microsoft's Q&A forums, with some teams reporting workflow disruptions after widespread installation of the patch. BleepingComputer could not reproduce the bug on a tested Excel 2019 build, suggesting the issue may not affect all configurations equally.
GoKawiil's interpretation of the reporting above, not reported fact.
Copy-paste and autofill are core to everyday spreadsheet work, so a patch that breaks them can halt business operations at scale, especially when the update rolls out automatically to many machines before the flaw is caught. It also highlights the recurring risk in mandatory security patching: fixes meant to close vulnerabilities can introduce new productivity-breaking bugs, forcing IT teams to choose between security exposure and functional software.
- KB5002914 update reportedly breaks Excel copy-paste and formula dragging across multiple versions.
- Affected users restored functionality by uninstalling or rolling back the update via MSI or Click-to-Run methods.
- Microsoft has not yet confirmed the bug, and testing by outside reviewers couldn't reproduce it on all builds.
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See Microsoft 365 Personal (1-Year Subscription) on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: bleepingcomputer.com, 2026-09-10
Published there as: “Microsoft Excel KB5002914 update breaks copy and paste for some users”
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