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Excel security is a myth: Passwords and hidden rows won't save your data, but this will

Excel is designed for transparency and calculation, which is exactly why it's so bad at keeping secrets. It offers plenty of ways to keep your data out of sight, but don't mistake those for actual ...
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A 'fascinating' Microsoft Excel security flaw teams up spreadsheets and Copilot Agent to steal data

Microsoft's latest Patch Tuesday release fixes 83 flaws Including an Excel bug which enables AI-driven zero-click data theft Update urged to block exfiltration via Copilot assistant The March 2026 ...