CVE-2026-40360

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Score

CVSS 3.1 7.8 High

Status

Analyzed - secure@microsoft.com

Published

2026-05-12

Last modified

2026-10-26

Weaknesses

CWE-125

Affected products

• 365 Apps (Microsoft)
• Excel (Microsoft)
• Excel 2016 (Microsoft)
• Office (Microsoft)
• Office 2019 (Microsoft)
• Office 2021 (Microsoft)
• Office 2024 (Microsoft)
• Office Long Term Servicing Channel (Microsoft)
• Office Macos 2021 (Microsoft)
• Office Macos 2024 (Microsoft)
• Office Online Server (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40360