Use-after-free in Microsoft 365 Apps for Enterprise and Microsoft Office LTSC - CVE-2025-59243
Published: October 15, 2025
Vulnerability identifier: #VU117246
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-2025-59243
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Microsoft Excel. A remote attacker can trick a victim to open a specially crafted file and execute arbitrary code on the target system.
Affected software
Microsoft 365 Apps for Enterprise
Microsoft Office LTSC
Microsoft Office LTSC
How to mitigate CVE-2025-59243
Install updates from vendor's website.