mfa/FIDO2.py in django-mfa2 before 2.5.1 and 2.6.x before 2.6.1 allows a replay attack that could be used to register another device for a user. The device registration challenge is not invalidated after usage.
"https://github.com/pypa/advisory-database/blob/main/vulns/django-mfa2/PYSEC-2022-303.yaml"