Your RSA-2048 keys break in 2030. Find every one of them before attackers do.
🐘 Packagist
Not in CISA KEV

CVE-2026-4208 — ralffreit/mfa-email

Fix: MrSilaz/mfa_email@0bb7e85

CVE-2026-4208 is a CWE-639 vulnerability in ralffreit/mfa-email. A fix is available for ralffreit/mfa-email — see the affected versions and patch details below.

Authentication Bypass in extension "E-Mail MFA Provider" (mfa_email)

Also known asGHSA-29r8-gvx4-r9w3
Published
Mar 17, 2026
Updated
Aug 12, 2026
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Sep 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-4208.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs18th percentile — riskier than 18% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

2 pkgs affected
🐘ralffreit/mfa-email🐘ralffreit/mfa-email

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistralffreit/mfa-emailall versions1.0.7composer require ralffreit/mfa-email:^1.0.7
🐘Packagistralffreit/mfa-email≥ 2.0.0&&< 2.0.12.0.1composer require ralffreit/mfa-email:^2.0.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ralffreit/mfa-email, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update ralffreit/mfa-email to 1.0.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-4208 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-4208 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-4208. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is CVE-2026-4208 in your dependencies?

O3 Security finds CVE-2026-4208 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works
CVE-2026-4208: ralffreit/mfa-email | O3 Security