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high advisory

Microsoft Security Updates — July 2026

Roundup of Microsoft security advisories published in July 2026.

PoC PowerShell +516 roundup
10c 227i updated
high advisory

CVE-2026-40362: Microsoft Excel Heap-based Buffer Overflow Vulnerability

A heap-based buffer overflow vulnerability, identified as CVE-2026-40362, exists in Microsoft Office Excel, allowing an unauthenticated attacker with local access to execute arbitrary code.

Office Excel cve heap-based buffer overflow excel code execution windows
2r 1t 1c
medium advisory

CVE-2026-40360: Microsoft Excel Out-of-Bounds Read Information Disclosure

CVE-2026-40360 is an out-of-bounds read vulnerability in Microsoft Office Excel that allows an unauthorized attacker to disclose sensitive information locally.

Office Excel cve information-disclosure excel
2r 1t 1c
high advisory

CVE-2026-40359: Microsoft Excel Use-After-Free Vulnerability

CVE-2026-40359 is a use-after-free vulnerability in Microsoft Office Excel that allows a local attacker to execute arbitrary code by exploiting memory corruption.

Office Excel use-after-free code execution excel
1r 2t 1c