Description
In oauth2-server (aka node-oauth2-server) through 3.1.1, the value of the redirect_uri parameter received during the authorization and token request is checked against an incorrect URI pattern ("[a-zA-Z][a-zA-Z0-9+.-]+:") before making a redirection. This allows a malicious client to pass an XSS payload through the redirect_uri parameter while making an authorization request. NOTE: this vulnerability is similar to CVE-2020-7741.
Remediation
References
https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/grant-types/authorization-code-grant-type.js#L143
https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/validator/is.js#L12
https://github.com/oauthjs/node-oauth2-server/issues/637
https://tools.ietf.org/html/rfc3986#section-3
https://tools.ietf.org/html/rfc6749#section-3.1.2
Related Vulnerabilities
CVE-2020-27216 Vulnerability in maven package jetty:jetty
CVE-2020-15168 Vulnerability in maven package org.webjars.npm:node-fetch
CVE-2020-7656 Vulnerability in maven package org.webjars.bowergithub.jquery:jquery
CVE-2017-12617 Vulnerability in maven package org.apache.tomcat:catalina
CVE-2016-7103 Vulnerability in maven package org.webjars:jquery-ui