# (L1) Ensure all member users are 'MFA capable'

Every member user has registered at least one authentication method that can satisfy multifactor authentication.

Source: https://maester.dev/docs/tests/CIS.M365.5.2.3.4

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<div class="test-byline"><div class="test-byline-avatars"><a class="test-byline-avatar test-byline-avatar--author" href="/contributors/jeremyfinney-lgtm" title="jeremy finney · Original author"><img src="https://github.com/JeremyFinney-lgtm.png" alt="jeremy finney" width="28" height="28" loading="lazy" decoding="async" /></a></div><div class="test-byline-meta"><span class="test-byline-text">Contributed by <a href="/contributors/jeremyfinney-lgtm">jeremy finney</a></span><a class="test-byline-link" href="/contributors">All contributors →</a></div></div>

<p class="test-part">Part of <a href="/docs/tests/cis">CIS</a> · Entra ID · Authentication methods · <a href="/docs/tests">All checks</a></p>

```powershell title="Run this check"
Invoke-Maester -TestId CIS.M365.5.2.3.4
```

## Overview

Every member user has registered at least one authentication method that can satisfy multifactor authentication.

A Conditional Access policy that requires MFA only helps if users can complete it. A user who has not registered a usable method is either locked out when the policy is enforced or is excluded from it, and in both cases the account is protected by a password alone.

The test reads the registration report, which can lag behind recent changes by a short time. Accounts that are not used for interactive sign-in should be reviewed and, if no longer needed, disabled or removed.

#### Remediation action

1. Sign in to the [Microsoft Entra admin center](https://entra.microsoft.com).
2. Go to **Entra ID** > **Authentication methods** > [**User registration details**](https://entra.microsoft.com/#view/Microsoft_AAD_IAM/AuthenticationMethodsMenuBlade/~/UserRegistrationDetails).
3. Filter on **Is MFA capable** = **No** and **User type** = **Member**.
4. Ask each listed user to register a method at [https://aka.ms/mysecurityinfo](https://aka.ms/mysecurityinfo), or enable a registration campaign or a Conditional Access policy for the security information registration user action.
5. Disable or delete accounts that are no longer in use.

#### Related links

* [Microsoft Entra admin center - User registration details](https://entra.microsoft.com/#view/Microsoft_AAD_IAM/AuthenticationMethodsMenuBlade/~/UserRegistrationDetails)
* [Authentication methods activity](https://learn.microsoft.com/entra/identity/authentication/howto-authentication-methods-activity)
* [Nudge users to set up Microsoft Authenticator](https://learn.microsoft.com/entra/identity/authentication/how-to-mfa-registration-campaign)
* [CIS Microsoft 365 Foundations Benchmark v7.0.0 - 5.2.3.4](https://www.cisecurity.org/benchmark/microsoft_365)

## Details

<details>
<summary>Every attribute of this check</summary>

| Field | Value |
| --- | --- |
| Test ID | CIS.M365.5.2.3.4 |
| Severity | High |
| Suite | CIS |
| Product | Entra ID |
| Feature | Authentication methods |
| Area | Authentication |
| Resource type | User |
| User impact | Medium |
| Implementation cost | Medium |
| MITRE ATT&CK | T1078.004 Cloud Accounts, T1110.003 Password Spraying |
| Supports benchmark | CIS Microsoft 365 Foundations Benchmark (version 7.0.0), requirement 5.2.3.4 |
| Benchmark level | L1 |
| Benchmark profiles | E3 Level 1 |
| Supports controls | cis-m365:5.2.3.4, nist-800-53-r5:IA-2 |
| PowerShell test | [Test-MtCisAllMembersMfaCapable](https://github.com/maester365/maester/blob/main/tests/cis/Test.CIS.M365.5.2.3.4.ps1) |
| Services | Graph |
| Compatible licenses | AAD_PREMIUM |

</details>

## Source

- Test: [`tests/cis/Test.CIS.M365.5.2.3.4.ps1`](https://github.com/maester365/maester/blob/main/tests/cis/Test.CIS.M365.5.2.3.4.ps1)
- Documentation: [`tests/cis/Test.CIS.M365.5.2.3.4.md`](https://github.com/maester365/maester/blob/main/tests/cis/Test.CIS.M365.5.2.3.4.md)