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This rule detects attempts to exploit a deserialization vulnerability (CVE-2018-8421) in Microsoft SharePoint via a crafted workflow. The detection specifically looks for HTTP POST requests to the `/_vti_bin/webpartpages.asmx` endpoint containing `ValidateWorkflowMarkupAndCreateSupportObjects` and `workflowMarkupText` with CDATA, indicating an attempt to inject malicious XML.
