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CVE-2026-45484: Microsoft SharePoint Elevation of Privilege Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 35.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-09 · updated 2026-09-24
• Weakness: CWE-502

Description

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

Affected products

• Microsoft SharePoint Server: before 16.0.19725.20384; 2016, 2019 — fixed in 16.0.19725.20384
• Microsoft SharePoint Server Subscription Edition: from 16.0.0 before 16.0.19725.20384 — fixed in 16.0.19725.20384
• Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 16.0.5556.1005 — fixed in 16.0.5556.1005
• Microsoft SharePoint Server: from 16.0.0 before 16.0.10417.20153 — fixed in 16.0.10417.20153

How to fix

Upgrade to a fixed version: Microsoft SharePoint Server 16.0.19725.20384; Microsoft SharePoint Server Subscription Edition 16.0.19725.20384; Microsoft Sharepoint Enterprise Server 2016 16.0.5556.1005; Microsoft SharePoint Server 16.0.10417.20153. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45484

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