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Microsoft confirms KB5002914 Excel update breaks copy and paste

September 15, 2026 · BleepingComputer · Severity: MEDIUM

Microsoft has confirmed that copy and paste may silently fail for some Excel users after installing the September 2026 KB5002914 security update.

Key Takeaways

  • Microsoft confirmed that the September 2026 KB5002914 security update breaks copy and paste functionality in Excel.
  • The bug causes silent failures where copied content is not actually pasted, potentially causing data loss in spreadsheet workflows.
  • Microsoft is investigating the issue and recommends affected users track the known issue for a forthcoming fix.
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