affected:
- package:
    ecosystem: PyPI
    name: django-mfa2
    purl: pkg:pypi/django-mfa2
  ranges:
  - events:
    - introduced: '0'
    - fixed: 2.5.1
    - introduced: 2.6.0
    - fixed: 2.6.1
    type: ECOSYSTEM
  versions:
  - '0.8'
  - 0.8.5
  - 0.8.7
  - 0.8.8
  - 0.9.0
  - 0.9.1
  - 0.9.2
  - 0.9.4
  - 0.9.5
  - '1.0'
  - 1.0.1
  - 1.0.2
  - 1.0.3
  - 1.0.4
  - 1.0.5
  - '1.1'
  - 1.1.1
  - 1.1.2
  - 1.1.5
  - 1.1.6
  - 1.1.7
  - 1.1.8
  - 1.1.8.1
  - 1.2.0
  - 1.2.1
  - 1.3.0
  - 1.4.0
  - 1.4.1
  - 1.5.0
  - '1.6'
  - 1.7.0
  - 1.7.10
  - 1.7.11
  - 1.7.12
  - 1.7.13
  - 1.7.5
  - 1.7.6
  - 1.7.7
  - 1.7.8
  - 1.7.9
  - 1.8.0
  - 1.8.1
  - 1.9.0
  - 2.0.0
  - 2.0.1
  - 2.0.2
  - 2.0.3
  - 2.0.4
  - 2.0.5
  - 2.0.6
  - 2.1.0
  - 2.1.2
  - 2.1.2b1
  - 2.2.0
  - 2.2.0b1
  - 2.2.0b2
  - 2.3.0
  - 2.4.0
  - 2.5.0
  - 2.5.0b1
  - 2.5.0b2
  - 2.6.0
aliases:
- CVE-2022-42731
- GHSA-vw39-2wj9-4q86
details: 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.
id: PYSEC-2022-303
modified: '2026-06-10T16:51:10.083530Z'
published: '2022-10-11T14:15:00Z'
references:
- type: WEB
  url: https://github.com/mkalioby/django-mfa2/releases/tag/v2.6.1-release
- type: WEB
  url: https://github.com/mkalioby/django-mfa2/releases/tag/v2.5.1-release
- type: EVIDENCE
  url: https://github.com/mkalioby/django-mfa2/blob/0936ea253354dd95cb127f09d0efa31324caef27/mfa/FIDO2.py#L58
- type: WEB
  url: https://github.com/mkalioby/django-mfa2/blob/0936ea253354dd95cb127f09d0efa31324caef27/mfa/FIDO2.py#L58
- type: ADVISORY
  url: https://github.com/advisories/GHSA-vw39-2wj9-4q86