Integer overflow in Microsoft SharePoint Server - CVE-2026-88163
Published: October 14, 2026
Vulnerability identifier: #VU155358
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-88163
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to integer overflow or wraparound in Microsoft Office SharePoint when handling network-based interactions. A remote user can exploit the integer overflow over the network to execute arbitrary code.
Exploitation requires Manage List permissions. The Preview Pane is not an attack vector.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-88163
Install security update from vendor's website.
Microsoft SharePoint Server - update to 16.0.20326.20190