CVE-2026-4208 Authentication Bypass in extension "E-Mail MFA Provider" (mfa_email)
Attackers can bypass Multi-Factor Authentication by submitting an empty code, allowing unauthorized access to TYPO3 accounts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-4208?
CVE-2026-4208 is a high-severity authentication bypass vulnerability in TYPO3 Extension "E-Mail MFA Provider", published on 17 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-639
Which versions are affected by CVE-2026-4208?
4 open source packages ship an affected version, including ralffreit/mfa-email. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
ralffreit/mfa-email Packagist | All versions | 1.0.7 |
ralffreit/mfa-email Packagist | All versions | 1.0.7 |
ralffreit/mfa-email Packagist | From 2.0.0 | 2.0.1 |
ralffreit/mfa-email Packagist | From 2.0.0 | 2.0.1 |
Products include Mrsilaz Mfa Mail.
How do I fix CVE-2026-4208?
Upgrade ralffreit/mfa-email to a fixed version for your release line: 1.0.7 or 2.0.1.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-4208 being exploited?
There is no known exploitation of CVE-2026-4208 in the wild and no public exploit code.
Sources
Also known as GHSA-29r8-gvx4-r9w3.