Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. In versions prior to 5.3.3 or 4.10.20, a compromised Parse Server Cloud Code Webhook target endpoint allows an attacker to use prototype pollution to bypass the Parse Server
requestKeywordDenylist option. This issue has been patched in versions 5.3.3 and 4.10.20. There are no known workarounds.