CVE-2026-88198: CWE-862: Missing Authorization in Microsoft Microsoft SharePoint Server Subscription Edition
Description
CVE-2026-88198 is a high-severity vulnerability in Microsoft SharePoint Server Subscription Edition where missing authorization allows an authorized attacker to elevate privileges 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 (CWE-862) in Microsoft SharePoint Server Subscription Edition involves missing authorization controls that permit an authorized attacker to elevate their privileges remotely. The CVSS 3.1 score of 8.8 reflects high impact on confidentiality, integrity, and availability. The affected versions are >=16.0.0 and <16.0.20326.20190. Microsoft has released an official fix to address this issue.
Potential Impact
An attacker with authorized access to the network can exploit this vulnerability to gain elevated privileges, potentially leading to full compromise of the SharePoint server's confidentiality, integrity, and availability.
Mitigation Recommendations
Apply the official patch provided by Microsoft as detailed in their security update guide for CVE-2026-88198. This fix resolves the missing authorization issue. No additional mitigation steps are required beyond applying the official update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-09T21:59:30.886Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88198","vendor":"Microsoft"}]
Threat ID: 6ace85692cdf04f656a0030c
Added to database: 10/13/2026, 19:24:25 UTC
Last enriched: 10/14/2026, 01:04:14 UTC
Last updated: 10/14/2026, 01:04:14 UTC
Views: 2
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