Language: Python
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
def handler500(request, template_name="dpaste/500.html"):
    context = {}
    context.update(config.extra_template_context)
    response = render(request, template_name, context, status=500)
    add_never_cache_headers(response)
    return response