CVE-2022-42731Network attack vector

Unauthorized device registration via reusable FIDO2 challenge

Published Oct 11, 2022 · Updated May 20, 2025

Capture-replay in django-mfa2 before 2.5.1 and 2.6.x before 2.6.1 allows remote attackers to register another FIDO2 device for a user. The complete_reg function in mfa/FIDO2.py passes the session's fido_state to register_complete without consuming it, leaving the registration challenge reusable. Replaying a valid registration response can therefore attach an unauthorized authenticator to the targeted account.

CVSS severity7.5
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Capture-replay in django-mfa2 before 2.5.1 and 2.6.x before 2.6.1 allows remote attackers to register another FIDO2 device for a user. The complete_reg function in mfa/FIDO2.py passes the session's fido_state to register_complete without consuming it, leaving the registration challenge reusable. Replaying a valid registration response can therefore attach an unauthorized authenticator to the targeted account.

The record

CVE
CVE-2022-42731
Published
Oct 11, 2022
Updated
May 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-294, CAPEC-60, T1556.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2022CVE publishedPublication date reported by the CVE source.
  2. May 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
CAPEC-60Reusing Session IDs (aka Session Replay)
T1556.006Modify Authentication Process: Multi-Factor Authentication

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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