CVE-2021-42357: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

When using Apache Knox SSO, a request could be crafted to redirect a user to a malicious page due to improper URL parsing. A request that included a specially crafted request parameter could be used to redirect the user to a page controlled by an attacker. This URL would need to be presented to the user outside the normal request flow through a XSS or phishing campaign.