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Severity: high

Command Injection



All versions of expressfs are vulnerable to Command Injection. The package does not validate user input on several API endpoints, allowing attackers to run arbitrary commands in the system. The affected endpoints are: expressfs.appendFile, expressfs.cp, expressfs.create and expressfs.rmdir.


No fix is currently available. Consider using an alternative module until a fix is made available.

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Advisory timeline

  1. published

    Advisory Published
    Jun 10th, 2019
  2. reported

    Reported by Microsoft Vulnerability Research
    Jun 10th, 2019