MFA Bypass Vulnerability in TYPO3 Extension
CVE-2026-4208

7.7HIGH

Key Information:

Vendor

Typo3

Status
Extension "e-mail Mfa Provider"
Vendor
CVE Published:
17 March 2026

What is CVE-2026-4208?

The TYPO3 extension has a flaw that prevents it from correctly resetting the MFA code after a user successfully logs in. As a consequence, an attacker could potentially bypass multi-factor authentication in future login attempts by simply submitting an empty string as the MFA code. This vulnerability undermines the security provided by MFA, exposing sensitive information and systems to unauthorized access.

Affected Version(s)

Extension "E-Mail MFA Provider" 0 <= 1.0.5

Extension "E-Mail MFA Provider" 2.0.0

References

https://typo3.org/security/advisory/typo3-ext-sa-2026-007

CVSS V4

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jan Holtkötter
.