CVE-2025-54897: Microsoft SharePoint Remote Code Execution Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 21.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-09 · updated 2026-10-18
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: before 16.0.19127.20100; 2016, 2019 — fixed in 16.0.19127.20100
Microsoft SharePoint Server Subscription Edition: from 16.0.0 before 16.0.19127.20100 — fixed in 16.0.19127.20100
Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 16.0.5517.1000 — fixed in 16.0.5517.1000
Microsoft SharePoint Server: from 16.0.0 before 16.0.10417.20047 — fixed in 16.0.10417.20047

How to fix

Upgrade to a fixed version: Microsoft SharePoint Server 16.0.19127.20100; Microsoft SharePoint Server Subscription Edition 16.0.19127.20100; Microsoft Sharepoint Enterprise Server 2016 16.0.5517.1000; Microsoft SharePoint Server 16.0.10417.20047. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-54897

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