CVE-2019-20920

A flaw was found in nodejs-handlebars, where affected versions of handlebars are vulnerable to arbitrary code execution. The package lookup helper fails to properly validate templates, allowing attackers to submit templates that execute arbitrary JavaScript into the system. This issue is used to run arbitrary code in a server processing Handlebars templates or on a victim’s browser (effectively serving as Cross-Site Scripting). The highest threat from this vulnerability is to confidentiality.