Out-of-bounds read in Microsoft Office for macOS - CVE-2026-68813

Vulnerability details

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to out-of-bounds read in Microsoft Office Excel when parsing a specially crafted file. A remote attacker can trick the victim into opening a crafted file to disclose sensitive information.

The Preview Pane is not an attack vector. User interaction is required to open a crafted file, and successful exploitation could allow reading portions of process memory.

Affected software

How to mitigate CVE-2026-68813

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-68813
• https://go.microsoft.com/fwlink/p/?linkid=831049

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office