Remote User Account Creation Vulnerability in 2FAuth by Bubka
CVE-2026-63438

9.8CRITICAL

Key Information:

Vendor

Bubka

Status
2fauth
Vendor
CVE Published:
6 November 2026

What is CVE-2026-63438?

A flaw in 2FAuth allows unauthenticated remote clients to exploit the application by creating an administrator account and manipulating email settings. If the AUTHENTICATION_GUARD is configured to accept headers from unverified clients, the system can promote the first created account to admin status. This vulnerability compromises the integrity of 2FA services, potentially exposing sensitive authentication secrets, unless mitigated by updating to version 8.0.0.

Affected Version(s)

2FAuth < 8.0.0

References

https://github.com/Bubka/2FAuth/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/Bubka/2FAuth/commit/43873cbfba445926c7...
x_refsource_MISC
https://github.com/Bubka/2FAuth/commit/8a4c395cac97f8b70b...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.