CVE-2026-26106: Microsoft SharePoint Server Remote Code Execution Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-10 · updated 2026-06-19
Weakness: CWE-20

Description

Improper input validation in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Affected products

Microsoft SharePoint Server: before 16.0.19725.20076; 2016, 2019 — fixed in 16.0.19725.20076
Microsoft SharePoint Server Subscription Edition: from 16.0.0 before 16.0.19725.20076 — fixed in 16.0.19725.20076
Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 16.0.5543.1000 — fixed in 16.0.5543.1000
Microsoft SharePoint Server: from 16.0.0 before 16.0.10417.20102 — fixed in 16.0.10417.20102

How to fix

Upgrade to a fixed version: Microsoft SharePoint Server 16.0.19725.20076; Microsoft SharePoint Server Subscription Edition 16.0.19725.20076; Microsoft Sharepoint Enterprise Server 2016 16.0.5543.1000; Microsoft SharePoint Server 16.0.10417.20102. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26106

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