Advisory 2023-06/04 Prototype Pollution of Object Returned by JSON5

Vulnerability typePrototype Pollution
Severity factors

This vulnerability has a CVSS score of 8.8 with a high severity rating.

Versions affectedFileCloud Versions 22.1 and earlier
Version fixedFileCloud Version 23.1 and later


In the version of a JSON5 package used in FileCloud, attributes on prototype objects could have been maliciously modified, causing prototype pollution.


This vulnerabilities has been fixed in FileCloud version

What you should do to fix this vulnerability

  • If you are using FileCloud Server, it is recommended that you update to the latest version, which is or greater. This will resolve the issue.
  • If you are using FileCloud Online, your site has already been updated to the latest version.

If you have any questions about this advisory, please contact FileCloud support.