An issue was discovered in MediaWiki before 1.35.11, 1.36.x through 1.38.x before 1.38.7, and 1.39.x before 1.39.4. BlockLogFormatter.php in BlockLogFormatter allows XSS in the partial blocks feature.
{
"versions": [
{
"introduced": "0"
},
{
"fixed": "1.35.11"
},
{
"introduced": "1.36.0"
},
{
"fixed": "1.38.7"
},
{
"introduced": "1.39.0"
},
{
"fixed": "1.39.4"
}
]
}