In Django 1.11.x before 1.11.18, 2.0.x before 2.0.10, and 2.1.x before 2.1.5, an Improper Neutralization of Special Elements in Output Used by a Downstream Component issue exists in django.views.defaults.page_not_found(), leading to content spoofing (in a 404 error page) if a user fails to recognize that a crafted URL has malicious content.
{
    "nvd_published_at": "2019-01-09T23:29:00Z",
    "severity": "HIGH",
    "github_reviewed_at": "2020-06-16T20:53:52Z",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-20"
    ]
}