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Copy frozen at (site build).
vulnerabilities
Microsoft confirms KB5002914 Excel update breaks copy and paste
Microsoft acknowledged that the September 2026 KB5002914 security update causes copy and paste functionality to silently fail for some Excel users. The issue affects basic workflow operations following a routine patch deployment.
Why it matters: Excel users across all organizations may experience silent failures in copy and paste operations after applying this mandatory security update, disrupting productivity until a fix is released.
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