In MediaWiki through 1.37, XSS can occur in Wikibase because an external identifier property can have a URL format that includes a $1 formatter substitution marker, and the javascript: URL scheme (among others) can be used.
{
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"
],
"source": "CPE_STRING",
"extracted_events": [
{
"introduced": "35"
},
{
"last_affected": "35"
}
],
"vendor_product": "fedoraproject:fedora"
}
]
}{
"cpe": "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
"source": "CPE_RANGE",
"extracted_events": [
{
"introduced": "0"
},
{
"last_affected": "1.37"
}
]
}