CVE-2026-88163: CWE-190: Integer Overflow or Wraparound in Microsoft Microsoft SharePoint Server Subscription Edition
Description
CVE-2026-88163 is an integer overflow or wraparound vulnerability in Microsoft SharePoint Server Subscription Edition. It allows an authorized attacker to execute code remotely over a network. The vulnerability affects versions from 16.0.0 up to but not including 16.0.20326.20190. A high-severity issue with a CVSS score of 8.8, an official fix is available from Microsoft.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft SharePoint Server Subscription Edition
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an integer overflow or wraparound in Microsoft SharePoint Server Subscription Edition that can be exploited by an authorized attacker to achieve remote code execution over a network. The affected versions are >=16.0.0 and <16.0.20326.20190. The CVSS v3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely on the affected SharePoint server, potentially leading to full compromise of the system, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update for Microsoft SharePoint Server Subscription Edition to versions 16.0.20326.20190 or later to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-09T21:58:19.187Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88163","vendor":"Microsoft"}]
Threat ID: 6ace85632cdf04f6569ff91e
Added to database: 10/13/2026, 19:24:19 UTC
Last enriched: 10/14/2026, 01:19:46 UTC
Last updated: 10/14/2026, 01:19:46 UTC
Views: 2
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