Microsoft has released an updated version of its “Outlook for Android” that patches an important security vulnerability in the popular email app that is currently being used over 100 million users. If exploited, remote attackers can execute malicious in-app client-side code on the targeted devices just by sending them emails with a specially crafted message. The technical details or any proof-of-concept of this flaw is not yet available in public and Microsoft is currently not aware of any attack in the wild related to this issue.
Source: https://thehackernews.com/2019/06/outlook-app-android.html