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"
}