CVE-2026-26114: Microsoft SharePoint Server Remote Code Execution Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.1% 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-502

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Affected products

Microsoft SharePoint Server: 2016, 2019
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 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-2026-26114

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