Description
htmlfile in lib/transport/htmlfile.js in SockJS before 0.3.0 is vulnerable to Reflected XSS via the /htmlfile c (aka callback) parameter.
Remediation
References
https://www.sockjs.org
https://github.com/theyiyibest/Reflected-XSS-on-SockJS
https://snyk.io/vuln/SNYK-JS-SOCKJS-548397
https://github.com/theyiyibest/Reflected-XSS-on-SockJS/issues/1