CVE-2021-21673

Name of the Vulnerable Software and Affected Versions Jenkins CAS Plugin versions 1.6.0 and earlier

Description The issue improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks by having users go to a Jenkins URL that will forward them to a different site after successful authentication.

Recommendations For Jenkins CAS Plugin versions 1.6.0 and earlier, update to version 1.6.1 or later, which only redirects to relative Jenkins URLs, mitigating the phishing attack risk.