An issue was discovered in MediaWiki before 1.35.9, 1.36.x through 1.38.x before 1.38.5, and 1.39.x before 1.39.1. There is XSS in Wikibase date formatting via wikibase-time-precision-* fields. This allows JavaScript execution by staff/admin users who do not intentionally have the editsitejs capability.
{
"cpes": [
"cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*",
"cpe:2.3:a:mediawiki:mediawiki:1.39.0:-:*:*:*:*:*:*",
"cpe:2.3:a:mediawiki:mediawiki:1.39.0:rc0:*:*:*:*:*:*",
"cpe:2.3:a:mediawiki:mediawiki:1.39.0:rc1:*:*:*:*:*:*"
],
"severity": "Medium"
}