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CVE-2025-53771— Microsoft SharePoint Server Spoofing Vulnerability

Quick assessment

Affected
Microsoft Microsoft SharePoint Enterprise Server 2016
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft SharePoint Server是美国微软（Microsoft）公司的一款协作平台。 Microsoft SharePoint Server存在授权问题漏洞，该漏洞源于路径遍历限制不当，可能导致欺骗攻击。

CVSS 6.5 · Medium EPSS 99.86% · P100

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-53771

Vulnerability Information
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Vulnerability Title
Microsoft SharePoint Server Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft SharePoint Server 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft SharePoint Server是美国微软（Microsoft）公司的一款协作平台。 Microsoft SharePoint Server存在授权问题漏洞，该漏洞源于路径遍历限制不当，可能导致欺骗攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.0 ~ 16.0.5513.1001 -
Microsoft Microsoft SharePoint Server 2019 16.0.0 ~ 16.0.10417.20037 -
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0 ~ 16.0.18526.20508 -

II. Public POCs for CVE-2025-53771

# POC Description Source Link Shenlong Link
1 Microsoft Office SharePoint Server contains an improper authentication vulnerability that allows unauthorized attackers to perform spoofing over a network. By crafting a POST request to /_layouts/15/ToolPane.aspx with a forged Referer header (/_layouts/SignOut.aspx), attackers can bypass authentication mechanisms and gain unauthorized access to protected endpoints. This vulnerability is part of the ToolShell exploit chain and is a patch bypass for CVE-2025-49706. When chained with CVE-2025-53770 (deserialization vulnerability), it enables unauthenticated remote code execution on SharePoint Server. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-53771.yaml POC Details
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III. Intelligence Information for CVE-2025-53771

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IV. Related Vulnerabilities

Same product: Microsoft SharePoint Enterprise Server 2016
Same vendor: Microsoft
Same weakness: CWE-287

V. Comments for CVE-2025-53771

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