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CVE-2026-4208— Authentication Bypass in extension "E-Mail MFA Provider" (mfa_email)

Quick assessment

Affected
TYPO3 Extension "E-Mail MFA Provider"
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TYPO3 E-Mail MFA Provider是Ralf Freit个人开发者的一个基于电子邮件实现多因素身份验证的扩展组件。 TYPO3 E-Mail MFA Provider 存在安全漏洞，该漏洞源于扩展程序在成功身份验证后未能正确重置生成的MFA代码，可能导致未来登录尝试时通过提供空字符串作为MFA代码来绕过MFA。

AI Predicted 7.5 Difficulty: Easy EPSS 0.45% · P37
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I. Basic Information for CVE-2026-4208

Vulnerability Information
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Vulnerability Title
Authentication Bypass in extension "E-Mail MFA Provider" (mfa_email)
Source: CVE Program / CVE List V5
Vulnerability Description
The extension fails to properly reset the generated MFA code after successful authentication. This leads to a possible MFA bypass for future login attempts by providing an empty string as MFA code to the extensions MFA provider.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
TYPO3 E-Mail MFA Provider 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TYPO3 E-Mail MFA Provider是Ralf Freit个人开发者的一个基于电子邮件实现多因素身份验证的扩展组件。 TYPO3 E-Mail MFA Provider 存在安全漏洞，该漏洞源于扩展程序在成功身份验证后未能正确重置生成的MFA代码，可能导致未来登录尝试时通过提供空字符串作为MFA代码来绕过MFA。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TYPO3 Extension "E-Mail MFA Provider" 0 ~ 1.0.5 -

II. Public POCs for CVE-2026-4208

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III. Intelligence Information for CVE-2026-4208

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Vendor Advisories for CVE-2026-4208 (1)

Same Patch Batch · TYPO3 · 2026-03-17 · 3 CVEs total

CVE-2026-4202 Broken Access Control in extension "Redirect Tab"
CVE-2026-1323 Insecure Deserialization in extension "Mailqueue" (mailqueue)

IV. Related Vulnerabilities

Same vendor: TYPO3
Same weakness: CWE-639

V. Comments for CVE-2026-4208

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