CVE-2025-53770: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft SharePoint Enterprise Server 2016
Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.
AI Analysis
Technical Summary
This vulnerability (CVE-2025-53770) involves the deserialization of untrusted data in on-premises Microsoft SharePoint Server 2016 (version 16.0.0). An unauthorized attacker can exploit this flaw over a network to execute arbitrary code remotely. Microsoft has confirmed the existence of exploits in the wild and is currently testing a comprehensive update to fix the issue. Until the official patch is released, Microsoft recommends applying the provided mitigation workaround to protect systems from exploitation. The vulnerability has a CVSS v3.1 base score of 9.8, reflecting its critical impact and ease of exploitation.
Potential Impact
Successful exploitation allows an unauthenticated attacker to execute arbitrary code remotely on affected SharePoint servers, potentially leading to full system compromise including confidentiality, integrity, and availability impacts. This poses a critical risk to organizations running the affected version of SharePoint Enterprise Server 2016.
Mitigation Recommendations
Microsoft has not yet released an official patch but has provided a workaround to mitigate exploitation risks. Organizations should apply the recommended mitigation steps detailed in the Microsoft advisory at https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/ until the comprehensive update is available. Monitoring the Microsoft Security Update Guide for the forthcoming patch is advised.
CVE-2025-53770: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.
CVSS v3.1
Score 9.8critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2025-53770) involves the deserialization of untrusted data in on-premises Microsoft SharePoint Server 2016 (version 16.0.0). An unauthorized attacker can exploit this flaw over a network to execute arbitrary code remotely. Microsoft has confirmed the existence of exploits in the wild and is currently testing a comprehensive update to fix the issue. Until the official patch is released, Microsoft recommends applying the provided mitigation workaround to protect systems from exploitation. The vulnerability has a CVSS v3.1 base score of 9.8, reflecting its critical impact and ease of exploitation.
Potential Impact
Successful exploitation allows an unauthenticated attacker to execute arbitrary code remotely on affected SharePoint servers, potentially leading to full system compromise including confidentiality, integrity, and availability impacts. This poses a critical risk to organizations running the affected version of SharePoint Enterprise Server 2016.
Mitigation Recommendations
Microsoft has not yet released an official patch but has provided a workaround to mitigate exploitation risks. Organizations should apply the recommended mitigation steps detailed in the Microsoft advisory at https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/ until the comprehensive update is available. Monitoring the Microsoft Security Update Guide for the forthcoming patch is advised.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-07-09T13:25:25.500Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- workaround
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770","vendor":"Microsoft"},{"url":"https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/","vendor":"Microsoft"}]
Threat ID: 687c4361a83201eaac002e92
Added to database: 07/20/2025, 01:16:17 UTC
Last enriched: 08/04/2026, 13:23:02 UTC
Last updated: 08/23/2026, 10:52:05 UTC
Views: 984
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