Stack-based buffer overflow in Microsoft Office - CVE-2026-123375
Published: November 11, 2026
Vulnerability identifier: #VU165471
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-2026-123375
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code with the victim user's privileges.
The vulnerability exists due to a stack-based buffer overflow in Microsoft Office Outlook when previewing a specially crafted attachment. A remote attacker can send such an attachment and convince a user to preview it in Outlook to execute arbitrary code with that user's privileges.
The Preview Pane is not an attack vector for this vulnerability.
Affected software
Microsoft Office
How to mitigate CVE-2026-123375
Install security update from vendor's website.
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140