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Rewterz Threat Advisory – CVE-2021-26420 – Microsoft SharePoint Remote Code Execution Vulnerability

Severity

Medium

Analysis Summary

CVE-2021-26420

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft SharePoint. Authentication is required to exploit this vulnerability. 

A specific flaw exists within the System.Workflow.ComponentModel.Compiler.WorkflowCompilerInternal class. This class allows an attacker to specify a path to an arbitrary workflow definition file. An attacker can leverage this vulnerability to execute code in the context of the web service account.

Impact

  • Code Execution
  • Unauthorized Access

Affected Vendors

Microsoft

Affected Products

  • SharePoint

Remediation

Use Microsoft Automatic Update to apply the appropriate patch for your system, or the Microsoft Security Update Guide to search for available patches.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26420

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