What is CVE-2026-4208?

CVE-2026-4208 is a high-severity vulnerability in Mrsilaz Mfa Mail, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.8/10. Published 2026-03-17.

How severe is CVE-2026-4208?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Mrsilaz Mfa Mail

CVE-2026-4208

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.

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.003 (17.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mrsilaz Mfa_mail — versions 2.0.0
Typo3 Extension "E-mail Mfa Provider" — versions 0, 2.0.0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

f4fb688c-4412-4426-b4b8-421ecf27b14a (Vendor Advisory)

Frequently asked questions

What is CVE-2026-4208?: CVE-2026-4208 is a high-severity vulnerability in Mrsilaz Mfa Mail, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.8/10. Published 2026-03-17.
How severe is CVE-2026-4208?: High severity. CVSS v3 base score is 8.8 out of 10.