CVE-2026-88166: CWE-190: Integer Overflow or Wraparound in Microsoft Microsoft SharePoint Server Subscription Edition
Description
CVE-2026-88166 is an integer overflow or wraparound vulnerability in Microsoft SharePoint Server Subscription Edition that 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. 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, tracked as CVE-2026-88166, involves an integer overflow or wraparound issue in Microsoft SharePoint Server Subscription Edition. It enables an attacker with authorized access to execute arbitrary code remotely over the network. The CVSS v3.1 base score is 8.8, indicating high severity, with attack vector network, low attack complexity, and no user interaction required. The vulnerability affects versions >=16.0.0 and <16.0.20326.20190. Microsoft has released 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. The vulnerability impacts confidentiality, integrity, and availability with high severity.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88166 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-2026-88166","vendor":"Microsoft"}]
Threat ID: 6ace85632cdf04f6569ff920
Added to database: 10/13/2026, 19:24:19 UTC
Last enriched: 10/14/2026, 01:19:38 UTC
Last updated: 10/14/2026, 01:19:38 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.