Microsoft SharePoint Deserialization of Untrusted Data RCE
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 Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
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.
Implement strict network segmentation and firewall rules to restrict access to SharePoint servers, allowing only necessary traffic from trusted sources. Deploy an Intrusion Detection/Prevention System (IDS/IPS) to monitor for suspicious network patterns or exploit attempts targeting deserialization vulnerabilities. Enhance logging and monitoring for SharePoint services to detect unusual process activity, unexpected file modifications, or anomalous network connections originating from the server.
Apply the official security patches released by Microsoft as soon as they become available to address CVE-2026-58644. Regularly review Microsoft's security advisories for SharePoint to ensure all affected versions are updated promptly. Prioritize patching critical production environments and conduct thorough testing in a staging environment before widespread deployment.
An unauthorized attacker can achieve remote code execution (RCE) on the affected SharePoint server by exploiting deserialization of untrusted data. This allows them to fully compromise the server, exfiltrate sensitive data, or disrupt critical business operations. The high severity of this vulnerability means significant data breaches and extensive operational downtime are severe business 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 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.
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.