Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-B805D7B4-9C0C-11E9-97F0-000C29E96DB4:
Django security releases issued:
When deployed behind a reverse-proxy connecting to Django via HTTPS,
django.http.HttpRequest.scheme would incorrectly detect client requests
made via HTTP as using HTTPS. This entails incorrect results for is_secure(),
and build_absolute_uri(), and that HTTP requests would not be redirected to
HTTPS in accordance with SECURE_SSL_REDIRECT.
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