Out-of-bounds read in Microsoft Office for macOS and Microsoft Excel - CVE-2026-68797

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 specially crafted file to disclose sensitive information.

The Preview Pane is not an attack vector. Successful exploitation could allow reading portions of process memory.

Affected software

How to mitigate CVE-2026-68797

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-68797
• https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office