CVE-2025-53770 PoC — Microsoft SharePoint Server Remote Code Execution Vulnerability

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/backdoor/sharepoint-toolshell-backdoor.yaml

Associated Vulnerability

Title:Microsoft SharePoint Server Remote Code Execution Vulnerability (CVE-2025-53770)
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.

Description

Detects a persistent webshell named 'spinstall0.aspx' deployed on Microsoft SharePoint servers.
This file exposes sensitive cryptographic machineKey values from the SharePoint configuration,
indicating the presence of a ToolShell backdoor implant. This implant is linked to targeted
post-auth RCE campaigns exploiting CVE-2025-53770.

File Snapshot

Remarks

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