CVE-2025-29805 in Outlook
Summary
by MITRE • 04/08/2025
Exposure of sensitive information to an unauthorized actor in Outlook for Android allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 07/07/2026
This vulnerability represents a critical security flaw in Microsoft Outlook for Android that enables unauthorized information disclosure through network communications. The issue stems from insufficient access controls and inadequate data protection mechanisms within the mobile email client application, allowing malicious actors to potentially intercept or access sensitive information transmitted over network connections. The vulnerability manifests when the application fails to properly enforce authentication and authorization boundaries during data transmission processes, creating an avenue for adversaries to exploit network communications and extract confidential data.
The technical implementation of this flaw typically involves weaknesses in the application's network stack handling, where sensitive email content, user credentials, or personal information may be transmitted without proper encryption or access restrictions. This could occur through insecure socket connections, improper certificate validation, or insufficient transport layer security measures that leave communication channels vulnerable to interception attacks. The vulnerability aligns with CWE-200 which addresses exposure of sensitive information to unauthorized actors and represents a fundamental breakdown in the principle of least privilege within mobile email applications.
From an operational perspective, this vulnerability poses significant risks to organizations relying on mobile email communications, as it can lead to data breaches involving confidential business communications, personal identifiable information, or proprietary corporate data. Attackers may leverage this weakness to conduct passive network monitoring, man-in-the-middle attacks, or other reconnaissance activities that compromise the confidentiality of email communications. The impact extends beyond individual user accounts to potentially affect entire organizational communication infrastructures where mobile devices serve as primary access points for email services.
Organizations should implement immediate mitigations including mandatory security updates for Outlook for Android applications, enhanced network monitoring for suspicious traffic patterns, and deployment of additional security controls such as secure email gateways or network segmentation. The mitigation strategies should align with industry best practices from frameworks like NIST SP 800-53 and ISO 27001, emphasizing the need for continuous vulnerability assessment and remediation processes. Security teams must also consider implementing endpoint detection and response solutions to monitor for potential exploitation attempts and establish incident response procedures specifically addressing mobile email security vulnerabilities. Regular security awareness training for users regarding secure email practices and the importance of keeping applications updated remains crucial in reducing the attack surface associated with such exposure vulnerabilities.