In Eclipse Theia 0.3.9 to 1.8.1, the "mini-browser" extension allows a user to preview HTML files in an iframe inside the IDE. But with the way it is made it is possible for a previewed HTML file to trigger an RCE. This exploit only happens if a user previews a malicious file.
{
"nvd_published_at": "2021-09-01T18:15:00Z",
"cwe_ids": [
"CWE-346",
"CWE-668",
"CWE-942"
],
"severity": "HIGH",
"github_reviewed_at": "2021-09-02T17:12:13Z",
"github_reviewed": true
}