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Critical Microsoft Excel bug weaponizes Copilot Agent

The critical Excel flaw CVE-2026-26144 enables zero-click data exfiltration using Copilot Agent, part of Microsoft’s March 2026 Patch Tuesday fixing 83 vulnerabilities.

Summary by The Register
Could steal sensitive personal and financial data After a whopper of a Patch Tuesday last month, with six Microsoft flaws exploited as zero-days, March didn't exactly roar in like a lion. Just two of the 83 Microsoft CVEs released on Tuesday are listed as publicly known, and none is under active exploitation, which we're sure is a welcome change to sysadmins.…

7 Articles

It's the second Tuesday of the month again, which traditionally means Patch Tuesday for Microsoft. The security updates for March 2026 are now available. Users of Windows 11 version 26H1 (presumably very few) will receive KB5079466. ...See the article: Windows 11: March Patch Tuesday 2026 brings security updates and fixes

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BleepingComputer broke the news in on Tuesday, March 10, 2026.
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