CVE-2026-55048 Details

An integer overflow vulnerability has been identified in Microsoft Office Excel, allowing an unauthorized attacker to execute code locally. This issue arises from improper handling of integer values, which can be exploited by manipulating specific inputs.

Users can download the security update for this vulnerability through the Microsoft Update Catalog. For Microsoft Office 365 for Mac, the update is available via the Microsoft 365 for Mac update channel. Instructions for downloading the update can be found in the Microsoft 365 Apps Security Updates documentation.