MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. MediaWiki:blanknamespace potentially can be output as raw HTML with SCRIPT tags via LogFormatter::makePageLink(). This affects MediaWiki 1.33.0 and later.
{
    "severity": "Medium",
    "cpes": [
        "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*"
    ]
}