Server-Side Request Forgery in Microsoft Office SharePoint
CVE-2026-20958

5.4MEDIUM

Key Information:

Vendor

Microsoft
Status
Microsoft Sharepoint Enterprise Server 2016
Microsoft Sharepoint Server 2019
Microsoft Sharepoint Server Subscription Edition
Vendor
CVE Published:
13 January 2026

What is CVE-2026-20958?

A security flaw in Microsoft Office SharePoint permits an authorized attacker to leverage server-side request forgery (SSRF), potentially allowing them to access and disclose sensitive information via the network. This vulnerability highlights the importance of secure network configurations and the need for timely updates and patches to protect against unauthorized information disclosure.

Affected Version(s)

Microsoft SharePoint Enterprise Server 2016 x64-based Systems 16.0.0 < 16.0.5535.1001

Microsoft SharePoint Server 2019 x64-based Systems 16.0.0 < 16.0.10417.20083

Microsoft SharePoint Server Subscription Edition x64-based Systems 16.0.0 < 16.0.19127.20442

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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