In Moodle before 3.9.1, 3.8.4 and 3.7.7, the filter in the admin task log required extra sanitizing to prevent a reflected XSS risk.
{
"versions": [
{
"introduced": "3.7.0"
},
{
"fixed": "3.7.7"
},
{
"introduced": "3.8.0"
},
{
"fixed": "3.8.4"
},
{
"introduced": "0"
},
{
"last_affected": "3.9.0-NA"
}
]
}