Type Confusion in Microsoft products - CVE-2025-59231
Published: October 15, 2025
Vulnerability identifier: #VU117259
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-59231
CWE-ID: CWE-843
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a type confusion error in Microsoft Excel. A remote attacker can trick a victim to open a specially crafted file, trigger a type confusion error and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Office Online Server
Microsoft 365 Apps for Enterprise
Microsoft Excel
Microsoft Office
Microsoft Office LTSC
Microsoft 365 Apps for Enterprise
Microsoft Excel
Microsoft Office
Microsoft Office LTSC
How to mitigate CVE-2025-59231
Install updates from vendor's website.