Out-of-bounds read in Microsoft Office for macOS and Microsoft Office - CVE-2026-63524

Vulnerability details

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to out-of-bounds read in Microsoft Office when parsing a crafted Office file. A remote attacker can send a specially crafted file to the victim to disclose sensitive information.

User interaction is required to open or preview the crafted file, and the Preview Pane is an attack vector.

Affected software

How to mitigate CVE-2026-63524

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-63524
• https://www.microsoft.com/en-us/microsoft-365/mac/microsoft-365-for-mac?msockid=35f9adb0e74b61392038b90de6fe608c

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Office