Description
Joomla! Core is prone to a cross-site request forgery vulnerability. Exploiting this issue may allow a remote attacker to perform certain administrative actions and gain unauthorized access to the affected application; other attacks are also possible. Joomla! Core versions 3.x.x ranging from 3.7.0 and up to and including 3.9.19 are vulnerable.
Remediation
Update to Joomla! Core version 3.9.20 or latest
References
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PHP Improper Input Validation Vulnerability (CVE-2012-0831)
Play Framework Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2020-12480)