Microsoft has addressed an important vulnerability (CVE-2019-1105) in Outlook for Android, potentially affected over 100 million users.

Microsoft has addressed an important flaw tracked as CVE-2019-1105 that affects versions of Outlook for Android app before 3.0.88.

The vulnerability is a stored cross-site scripting issue that is related to the way the app parses incoming email messages.

“A spoofing vulnerability exists in the way Microsoft Outlook for Android software parses specifically crafted email messages. An authenticated attacker could exploit the vulnerability by sending a specially crafted email message to a victim.” reads the security advisory published by Microsoft.

“The attacker who successfully exploited this vulnerability could then perform cross-site scripting attacks on the affected systems and run scripts in the security context of the current user.”

“The security update addresses the vulnerability by correcting how Outlook for Android parses specially crafted email messages.”

An attacker could exploit the vulnerability by sending a specially crafted message to the victim and run malicious code in the context of the current user. The vulnerability could potentially lead to spoofing attacks.

The spoofing issue was separately reported by multiple security researchers, at the time of writing Microsoft is not aware of any attack in the wild exploiting the flaw.

Microsoft did not publish technical details for the vulnerability.

Pierluigi Paganini

(SecurityAffairs – Outlook for Android, hacking)