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.
{ "binaries": [ { "binary_name": "mediawiki", "binary_version": "1:1.27.4-3" }, { "binary_name": "mediawiki-classes", "binary_version": "1:1.27.4-3" } ] }
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-45472.json"
{ "binaries": [ { "binary_name": "mediawiki", "binary_version": "1:1.31.7-1" }, { "binary_name": "mediawiki-classes", "binary_version": "1:1.31.7-1" } ] }
{ "binaries": [ { "binary_name": "mediawiki", "binary_version": "1:1.35.6-1" }, { "binary_name": "mediawiki-classes", "binary_version": "1:1.35.6-1" } ] }
{ "binaries": [ { "binary_name": "mediawiki", "binary_version": "1:1.39.7-1" }, { "binary_name": "mediawiki-classes", "binary_version": "1:1.39.7-1" } ] }
{ "binaries": [ { "binary_name": "mediawiki", "binary_version": "1:1.43.3+dfsg-1" }, { "binary_name": "mediawiki-classes", "binary_version": "1:1.43.3+dfsg-1" } ] }