Out-of-bounds read in Microsoft Office for macOS and Microsoft Office - CVE-2026-108453

Vulnerability details

The vulnerability allows a remote attacker to disclose information from heap memory.

The vulnerability exists due to an out-of-bounds read in Microsoft Office PowerPoint when processing presentation content. A remote attacker can trick a victim into previewing specially crafted presentation content to read small portions of heap memory.

Affected software

How to mitigate CVE-2026-108453

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-108453
• https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office