Release of invalid pointer or reference in Microsoft Office - CVE-2026-111309
Published: November 11, 2026
Vulnerability identifier: #VU164807
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-2026-111309
CWE-ID: CWE-763
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the victim's machine.
The vulnerability exists due to release of an invalid pointer or reference in Microsoft Office Outlook when processing a specially crafted email. A remote attacker can send a specially crafted email and convince a user to open or preview it, including in the Preview Pane, to execute arbitrary code on the victim's machine.
Affected software
Microsoft Office
How to mitigate CVE-2026-111309
Install security update from vendor's website.
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140