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.

Recommendation

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

References

• https://www.npmjs.com/advisories/953