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CVE-2025-53771: Microsoft SharePoint Server Spoofing Vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 99.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-07-20 · updated 2026-06-17
• Weakness: CWE-287

Description

Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

Affected products

• Microsoft SharePoint Server: before 16.0.18526.20508; 2016, 2019 — fixed in 16.0.18526.20508
• Microsoft SharePoint Server Subscription Edition: from 16.0.0 before 16.0.18526.20508 — fixed in 16.0.18526.20508
• Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 16.0.5513.1001 — fixed in 16.0.5513.1001
• Microsoft SharePoint Server: from 16.0.0 before 16.0.10417.20037 — fixed in 16.0.10417.20037

How to fix

Upgrade to a fixed version: Microsoft SharePoint Server 16.0.18526.20508; Microsoft SharePoint Server Subscription Edition 16.0.18526.20508; Microsoft Sharepoint Enterprise Server 2016 16.0.5513.1001; Microsoft SharePoint Server 16.0.10417.20037. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53771
• https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/

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