Out-of-bounds read in Microsoft 365 Apps for Enterprise and Microsoft Office - CVE-2026-69739

Vulnerability details

The vulnerability allows a remote attacker to disclose information.

The vulnerability exists due to an out-of-bounds read in Microsoft Office when user interaction occurs. A remote attacker can cause Microsoft Office to read out-of-bounds memory to disclose information.

The Preview Pane is not an attack vector.

Affected software

How to mitigate CVE-2026-69739

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-69739
• https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office