CVE-2022-42731: Django-MFA2 Project Django-MFA2

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

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.

Affected products

• Django-MFA2 Project Django-MFA2: before 2.5.1 (fixed in 2.5.1); from 2.6.0, before 2.6.1 (fixed in 2.6.1)

Published 2022-10-11. Last modified 2026-06-17.