URL Redirection to Untrusted Site ('Open Redirect')
An issue was discovered in Symfony 2.7.0 before 2.7.38, 2.8.x before 2.8.31, 3.x.x before 3.2.14, 3.3.x before 3.3.13, 3.4.0-BETAx before 3.4.0-BETA5, and 4.0.0-BETAx before 4.0.0-BETA5. DefaultAuthenticationSuccessHandler or DefaultAuthenticationFailureHandler takes the content of the _target_path parameter and generates a redirect response, but no check is performed on the path, which could be an absolute URL to an external domain. This Open redirect vulnerability can be exploited for example to mount effective phishing attacks.
CWE-601 - Open Redirect
An open redirect attack employs a URL parameter, HTML refresh tags, or a DOM based location change to exploit the trust of a vulnerable domain to direct the users to a malicious website. The attack could lead to higher severity vulnerabilities such as unauthorized access control, account takeover, XSS, and more.