If the algebra filter was enabled but not functional (eg the necessary binaries were missing from the server), it presented an XSS risk.
{ "cpes": [ "cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*", "cpe:2.3:a:moodle:moodle:3.11.0:-:*:*:*:*:*:*", "cpe:2.3:a:moodle:moodle:3.9.0:-:*:*:*:*:*:*", "cpe:2.3:a:moodle:moodle:4.0.0:-:*:*:*:*:*:*", "cpe:2.3:a:moodle:moodle:4.1.0:-:*:*:*:*:*:*", "cpe:2.3:a:moodle:moodle:4.1.1:*:*:*:*:*:*:*" ], "severity": "Medium" }