Out-of-bounds read in Microsoft products - CVE-2026-50408

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Main Vulnerability Database Vulnerabilities #VU138193

Out-of-bounds read in Microsoft products - CVE-2026-50408

Published: July 17, 2026


Vulnerability identifier: #VU138193
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-2026-50408
CWE-ID: CWE-125
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 out-of-bounds read in Microsoft Excel when parsing a crafted Office file. A remote attacker can trick the victim into opening a crafted file to disclose sensitive information.

User interaction is required to open a crafted file, and the Preview Pane is not an attack vector. Successful exploitation could disclose small portions of heap memory.


How to mitigate CVE-2026-50408

Install security update from vendor's website.

Sources