In Eclipse Theia versions up to and including 0.16.0, in the notification messages there is no HTML escaping, so Javascript code can run.
{
"cpe": "cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:*",
"extracted_events": [
{
"introduced": "0"
},
{
"last_affected": "0.16.0"
}
],
"source": "CPE_RANGE"
}