![]() How can you prevent apps using legacy authentication from accessing your tenant's resources? The recommendation is to just block them with a Conditional Access policy. With MFA, even if an attacker gets in possession of a user's password, the password alone isn't sufficient to successfully authenticate and access the data. One of the easiest things you can do to protect against password threats is to implement multifactor authentication (MFA). Passwords are also vulnerable to various attacks, like phishing and password spray. Passwords are bad as they're easy to guess and we (humans) are bad at choosing good passwords. Single factor authentication (for example, username and password) isn't enough these days. Apps using mail protocols like POP, IMAP, and SMTP AUTH.įor more information about modern authentication support in Office, see How modern authentication works for Office client apps.Examples of applications that commonly or only use legacy authentication are: This authentication pattern includes basic authentication, a widely used industry-standard method for collecting user name and password information. Legacy authentication can't prompt users for second factor authentication or other authentication requirements needed to satisfy Conditional Access policies, directly. Microsoft Entra ID supports the most widely used authentication and authorization protocols including legacy authentication. Conditional Access isn't intended to be an organization's first line of defense for scenarios like denial-of-service (DoS) attacks, but it can use signals from these events to determine access. This article assumes that you're familiar with the basic concepts of Microsoft Entra Conditional Access.Ĭonditional Access policies are enforced after first-factor authentication is completed. Customers may choose to first begin disabling basic authentication on a per-protocol basis, by applying Exchange Online authentication policies, then (optionally) also blocking legacy authentication via Conditional Access policies when ready.Ĭustomers without licenses that include Conditional Access can make use of security defaults to block legacy authentication. While rolling out legacy authentication blocking protection, we recommend a phased approach, rather than disabling it for all users all at once. ![]() This article explains how you can configure Conditional Access policies that block legacy authentication for all workloads within your tenant. For more information, see the article Deprecation of Basic authentication in Exchange OnlineĪlex Weinert, Director of Identity Security at Microsoft, in his Mablog post New tools to block legacy authentication in your organization emphasizes why organizations should block legacy authentication and what other tools Microsoft provides to accomplish this task: Effective October 1, 2022, we will begin to permanently disable Basic Authentication for Exchange Online in all Microsoft 365 tenants regardless of usage, except for SMTP Authentication. ![]()
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