An issue was discovered in Joomla! through 3.9.19. Missing validation checks on the usergroups table object can result in a broken site configuration.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15699
Reference (s):
- https://developer.joomla.org/security-centre/819-20200702-core-missing-checks-can-lead-to-a-broken-usergroups-table-record.html