Microsoft SharePoint Deserialization Remote Code Execution
Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.
An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
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.
Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.
Corroborated threat activity referencing this CVE — with source and confidence, not inference.
Named threat actors and observed ATT&CK techniques appear here as intel feeds are folded in — the ATT&CK chain above stays inferred until then.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
Restrict network access to SharePoint servers, particularly from untrusted external sources, and deploy a robust Web Application Firewall (WAF) to filter malicious requests. Implement enhanced logging and real-time monitoring for unusual process execution or network activity originating from SharePoint servers.
Apply the comprehensive security update from Microsoft immediately upon its release, as it fully addresses this vulnerability. Continuously monitor Microsoft's official security guidance and advisories for specific patch details and installation instructions for all affected SharePoint Server versions.
An unauthorized attacker can achieve remote code execution on affected on-premises SharePoint Servers over the network. This allows for complete system compromise, enabling data exfiltration, service disruption, or further network lateral movement, leading to severe business and data integrity consequences.
Other CVEs affecting sharepoint server
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Microsoft SharePoint Server Elevation of Privilege Vulnerability
A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package, aka 'Microsoft SharePoint Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-0594.
Weak authentication in Microsoft Office SharePoint allows an unauthorized attacker to bypass a security feature over a network.