CVE-2025-59231

Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Score

CVSS 3.1 7.8 High

Status

Analyzed - secure@microsoft.com

Published

2025-10-14

Last modified

2026-10-18

Weaknesses

CWE-843

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-2025-59231