Heap-based buffer overflow in Microsoft Office - CVE-2026-88207

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow in Microsoft Office PowerPoint when processing content. A remote attacker can exploit the Preview Pane attack vector to execute arbitrary code.

User interaction is required. Successful exploitation requires a deep understanding of the system and the ability to manipulate its components to trigger a specific condition.

Affected software

How to mitigate CVE-2026-88207

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-88207
• https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office