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

Another SharePoint vulnerability that is not confirmed to be exploited, but provides "more robust protections" than the update for CVE-2025-49706. RSO is monitoring.

Patches are available for SharePoint Server 2016, 2019 and Subscription Edition, as active exploitation continues.

The version of Sitecore XP running on the remote host is affected by an insecure deserialization vulnerability.
Sitecore deployments using the sample key provided with deployment instructions for XP 9.0 or earlier and Active Directory 1.4 are potentially vulnerable to an insecure ViewState deserialization vulnerability that could allow a remote, unauthenticated attacker to perform remote code execution and acquire non-authorized access to information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Microsoft SharePoint Server running on the remote host is affected by a remote code execution vulnerability:

  - Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft Office     SharePoint allows an unauthorized attacker to perform spoofing over a network. (CVE-2025-53771)

Note that this plugin only tests the SharePoint site collections at /, /my, /sites, /teams, and /personal.

Microsoft SharePoint Server Subscription Edition < 16.0.18526.20508 or 2016 < 16.0.5513.1001 or 2019 < 16.0.10417.20037 is affected by a vulnerability that allows an unauthenticated attacker to execute arbitrary code through insecure deserialization.

The Microsoft SharePoint Server 2016 installation on the remote host is missing security updates. It is, therefore, affected by multiple security vulnerabilities:

  - Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized     attacker to execute code over a network. (CVE-2025-53770)

  - Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft     Office SharePoint allows an authorized attacker to perform spoofing over a network. (CVE-2025-53771)

The Microsoft SharePoint Server Subscription Edition installation on the remote host is missing security updates. It is, therefore, affected by multiple security vulnerabilities:

  - Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft     Office SharePoint allows an authorized attacker to perform spoofing over a network. (CVE-2025-53771)

  - Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized     attacker to execute code over a network. (CVE-2025-53770)

The Microsoft SharePoint Server 2019 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft     Office SharePoint allows an authorized attacker to perform spoofing over a network. (CVE-2025-53771)

  - Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized     attacker to execute code over a network. (CVE-2025-53770)

ID	Name	Product	Family	Severity
261484	Sitecore XP Insecure Deserialization (SC2025-005)	Nessus	CGI abuses	critical
242983	Microsoft SharePoint Server Authentication Bypass (CVE-2025-53771)	Nessus	Web Servers	medium
114923	Microsoft SharePoint Remote Code Execution	Web App Scanning	Component Vulnerability	critical
242480	Security Updates for Microsoft SharePoint Server 2016 (July 2025)	Nessus	Windows : Microsoft Bulletins	high
242415	Security Updates for Microsoft SharePoint Server Subscription Edition (July 2025)	Nessus	Windows : Microsoft Bulletins	critical
242414	Security Updates for Microsoft SharePoint Server 2019	Nessus	Windows : Microsoft Bulletins	critical

Detections

Analytics

CVE-2025-53771

medium

Tenable Plugins

critical

medium

critical

high

critical

critical