CVE-2026-88155: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft SharePoint Server Subscription Edition
Description
CVE-2026-88155 is a heap-based buffer overflow 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. Microsoft has released an official fix to address this issue. The vulnerability has a high severity score of 8.8 and requires privileges to exploit but no user interaction. There are no known exploits in the wild at this time.
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 (CVE-2026-88155) is a heap-based buffer overflow in Microsoft SharePoint Server Subscription Edition that permits an authorized attacker to execute arbitrary code remotely. The flaw exists in versions >=16.0.0 and <16.0.20326.20190. The CVSS v3.1 base score is 8.8, indicating high impact with network attack vector, low attack complexity, and privileges required. Microsoft has published an official security update to remediate this vulnerability.
Potential Impact
Successful exploitation can lead to remote code execution with high confidentiality, integrity, and availability impact. An attacker with authorized access can execute arbitrary code on the vulnerable system over the network, potentially leading to full system compromise.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users should apply the security update available from the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88155 to remediate the issue. No additional mitigation steps are required beyond applying the official patch.
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-2026-88155","vendor":"Microsoft"}]
Threat ID: 6ace85612cdf04f6569ff913
Added to database: 10/13/2026, 19:24:17 UTC
Last enriched: 10/14/2026, 01:33:31 UTC
Last updated: 10/14/2026, 01:33:31 UTC
Views: 3
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