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. E-Widgets does widget replacement in HTML attributes, which can lead to XSS, because widget authors often do not expect that their widget is executed in an HTML attribute context.
{
"severity": "Medium",
"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:*:*:*:*:*:*"
]
}