Description
The Express web framework before 3.11 and 4.x before 4.5 for Node.js does not provide a charset field in HTTP Content-Type headers in 400 level responses, which might allow remote attackers to conduct cross-site scripting (XSS) attacks via characters in a non-standard encoding.
Remediation
References
https://nodesecurity.io/advisories/express-no-charset-in-content-type-header
https://bugzilla.redhat.com/show_bug.cgi?id=1203190