Heap-based buffer overflow in Microsoft products - CVE-2026-50678

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Main Vulnerability Database Vulnerabilities #VU138179

Heap-based buffer overflow in Microsoft products - CVE-2026-50678

Published: July 17, 2026


Vulnerability identifier: #VU138179
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-50678
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Office for macOS
Microsoft Excel
Office Online Server

Detailed vulnerability description

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to heap-based buffer overflow in Microsoft Office Excel when parsing a specially crafted file. A remote attacker can trick the victim into opening a crafted file to disclose sensitive information.

The Preview Pane is not an attack vector. An attacker who successfully exploited this vulnerability could potentially read small portions of heap memory.


How to mitigate CVE-2026-50678

Install security update from vendor's website.

Sources