Main Vulnerability Database Vulnerabilities #VU165134

Out-of-bounds read in Microsoft products - CVE-2026-118727

Published: November 11, 2026

Vulnerability identifier: #VU165134

CSH Severity: Medium

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-118727

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in Microsoft Office Excel when processing input with user interaction. A remote attacker can supply crafted input that causes reads beyond the bounds of a memory buffer to disclose sensitive information.

The Preview Pane is not an attack vector for this vulnerability.

Affected software

Microsoft Office for macOS
Microsoft Office
Office Online Server

How to mitigate CVE-2026-118727

Install security update from vendor's website.

Microsoft Office for macOS - update to 16.115.26110837
Office Online Server - update to 16.0.10417.20236
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140

External References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-118727

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