Django before 1.11.27, 2.x before 2.2.9, and 3.x before 3.0.1 allows account takeover. A suitably crafted email address (that is equal to an existing user's email address after case transformation of Unicode characters) would allow an attacker to be sent a password reset token for the matched user account. (One mitigation in the new releases is to send password reset tokens only to the registered user email address.)
https://www.djangoproject.com/weblog/2019/dec/18/security-releases/
https://www.debian.org/security/2020/dsa-4598
https://usn.ubuntu.com/4224-1/
https://security.netapp.com/advisory/ntap-20200110-0003/
https://security.gentoo.org/glsa/202004-17
https://seclists.org/bugtraq/2020/Jan/9
https://groups.google.com/forum/#%21topic/django-announce/3oaB2rVH3a0
https://docs.djangoproject.com/en/dev/releases/security/
http://packetstormsecurity.com/files/155872/Django-Account-Hijack.html