Use-after-free in Microsoft Excel and Microsoft Office - CVE-2026-62870
Published: July 31, 2026 / Updated: August 1, 2026
Vulnerability identifier: #VU140672
CSH Severity: High
CVSS v4.0: 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/E:U/U:Amber
CVE-ID: CVE-2026-62870
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
Microsoft Excel
Microsoft Office
Microsoft Excel
Microsoft Office
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to use-after-free in Microsoft Office Excel when parsing a specially crafted file. A remote attacker can trick the victim into opening a specially crafted file to execute arbitrary code.
User interaction is required to open a specially crafted file.
How to mitigate CVE-2026-62870
Install security update from vendor's website.