Escalated Privileges in Azure Containers with Python in Excel
A math function in Excel became a path to root in Microsoft's cloud. SafeBreach Labs researcher Ron Ben Yizhak reverse-engineered the isolated Azure containers behind Microsoft's Python in Excel feature—and found the "isolated" part didn't fully hold. Cloud isolation claims are a trust boundary. Trust boundaries get tested. What he found: Both issues were responsibly disclosed to Microsoft and patched between March and June 2026, and the research debuted at DEF CON 34.