Jupyter Notebook before 5.5.0 does not use a CSP header to treat served files as belonging to a separate origin. Thus, for example, an XSS payload can be placed in an SVG document.
{
"nvd_published_at": "2019-10-31T15:15:00Z",
"severity": "MODERATE",
"github_reviewed_at": "2019-11-07T23:25:31Z",
"github_reviewed": true,
"cwe_ids": [
"CWE-79"
]
}