SharePoint ToolShell Exploitation via ToolPane.aspx DisplayMode Edit (via webserver)

ATT&CK techniques

Initial Access

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects requests to the SharePoint ToolPane.aspx endpoint with the DisplayMode Edit parameter, the exploitation vector for the ToolShell chain CVE-2025-53770 and CVE-2025-53771 that abuses Referer header handling to reach authenticated functionality without authentication. Adversaries use this request to deploy a webshell and steal ASP.NET machine keys.

Reporting behind it

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SharePoint ToolShell Exploitation via ToolPane.aspx DisplayMode Edit (via webserver)

Pivot detection · T1190 · 9 related

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