The Mustache pix helper contained a potential Mustache injection risk if combined with user input (note: This did not appear to be implemented/exploitable anywhere in the core Moodle LMS).
{
"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": "Critical"
}