In Eclipse Theia versions up to and including 1.8.0, in the debug console there is no HTML escaping, so arbitrary Javascript code can be injected.
[
{
"product": "Eclipse Theia",
"vendor": "The Eclipse Foundation",
"versions": [
{
"lessThanOrEqual": "1.8.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]