An issue was discovered in Joomla! before 3.9.21. Lack of input validation in the vote feature of com_content leads to an open redirect.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24598
Reference (s):
- https://developer.joomla.org/security-centre/825-20200802-core-open-redirect-in-com-content-vote-feature