Out-of-bounds read in Microsoft Office for macOS and Microsoft Office - CVE-2026-111288

Vulnerability details

The vulnerability allows a remote attacker to disclose small portions of heap memory.

The vulnerability exists due to an out-of-bounds read in Microsoft Office Word when processing document content. A remote attacker can entice a victim to preview a specially crafted document in the Preview Pane to disclose information from heap memory.

Affected software

How to mitigate CVE-2026-111288

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-111288
• https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office