Microsoft 365 vulnerabilities

2 known vulnerabilities in Microsoft 365 from Microsoft. 2 are rated high or critical. Each entry lists the affected versions and the release that fixes it, where the vendor has published one.

Latest first

• 8.8 High severity

  Microsoft 365 Apps for Enterprise: Access of Resource Using Incompatible Type

  CVE-2026-65807Aug 11, 2026Microsoft

  Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

• 7.0 High severity

  Microsoft 365 Apps for Enterprise: Concurrent Execution using Shared Resource with Improper Synchronization

  CVE-2026-44818Jun 9, 2026Microsoft

  Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.