This hard stopping point for Basic Authentication will be problematic for organizations with custom apps that use the scheme, according to an FAQ section within an Exchange team announcement.

Basic Authentication (aka proxy authentication) is an HTTP-based auth scheme apps use to send locally stored credentials in plain text to servers, endpoints, or online services.

Microsoft's Exchange team is warning Exchange Online users that many of its customers are being targeted by password spray attacks using its basic authentication. The warning comes as Microsoft ...

Microsoft warned today that it will permanently turn off Exchange Online basic authentication starting early January 2023 to improve security.

This hard stopping point for Basic Authentication will be problematic for organizations with custom apps that use the scheme, according to an FAQ section within an Exchange team announcement.