CVE-2026-50678 Details

A heap-based buffer overflow vulnerability has been identified in Microsoft Office Excel. This vulnerability allows an unauthorized attacker to locally disclose information by exploiting the buffer overflow. The issue arises from improper handling of memory, which could potentially be manipulated to read sensitive data.

Users can download the security update for this vulnerability through the Microsoft Update Catalog. For Microsoft Office 2019, 2021, and LTSC 2024 (both 32-bit and 64-bit editions), as well as Microsoft 365 Apps for Enterprise (32-bit and 64-bit), the security update is available via the Office Update mechanism. For Microsoft Office LTSC for Mac 2021 and 2024, the security update can be downloaded through the Microsoft AutoUpdate tool.