Out-of-bounds read in Microsoft Office for macOS and Microsoft Office - CVE-2026-50665

Vulnerability details

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to out-of-bounds read in Microsoft Office for macOS when parsing a crafted Office file. A remote attacker can send a specially crafted file to a user and convince them to open it to disclose sensitive information.

User interaction is required to open a crafted Office file, and the Preview Pane is not an attack vector.

Affected software

How to mitigate CVE-2026-50665

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-50665
• https://go.microsoft.com/fwlink/p/?linkid=831049

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office