Buffer over-read in Microsoft Office for macOS and Microsoft Office - CVE-2026-112731

Vulnerability details

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to a buffer over-read in Microsoft Office when processing input with user interaction. A remote attacker can supply crafted input that, when processed through a victim's interaction, causes reads beyond a buffer boundary to disclose sensitive information.

The Preview Pane is not an attack vector for this vulnerability.

Affected software

How to mitigate CVE-2026-112731

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-112731
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-112731

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office