Microsoft Teams for Android Vulnerability Exposes User Credentials
A critical vulnerability in Microsoft Teams for Android, CVE-2026-65812, allows attackers to disclose sensitive user credentials with low complexity and user interaction.
Microsoft has issued a security update to address CVE-2026-65812, a significant vulnerability discovered in the Android version of its popular Microsoft Teams application. This flaw, rated as 'Important' by Microsoft, could enable an authorized attacker to disclose sensitive information, including user credentials.
The vulnerability is classified as an information disclosure issue, specifically falling under the CWE-201 category, known as Insertion of Sensitive Information Into Sent Data. This means that an application unintentionally includes confidential data in its transmitted content. In this particular case, exploited credentials could potentially be exposed over a network under specific conditions, posing a risk to user accounts.
Exploiting this vulnerability requires a low level of attack complexity and is remotely executable over a network. However, it also necessitates some form of user interaction, suggesting that an attacker might need to trick a Teams user into interacting with malicious content, such as a crafted message or a shared resource. Microsoft has not detailed the exact user interaction required, leaving room for various social engineering tactics.
The security impact is primarily focused on confidentiality. While the vulnerability does not allow attackers to alter data, execute code, or deny service, the potential exposure of authentication credentials could facilitate subsequent, more damaging attacks on user accounts or associated systems. The integrity and availability impacts are rated as None.
Fortunately, Microsoft has indicated that exploitation is less likely, with no known public disclosures or in-the-wild exploitation reported to date. There is also no confirmed public proof-of-concept exploit available. The specific affected version of Microsoft Teams for Android is build 1416/1.0.0.2026133602.
A fix for this vulnerability has been made available through an update to the Microsoft Teams app on Google Play. Organizations are strongly advised to ensure that all managed Android devices running Teams are updated to the latest version as soon as possible. Security teams should also review sign-in logs for any suspicious activity, particularly for accounts that utilize Teams on Android devices, given the potential for credential exposure.
The vulnerability was reported by Ofek Levin of Enclave through a coordinated vulnerability disclosure process. Microsoft has credited the researcher for their role in identifying and helping to resolve the issue before any widespread exploitation occurred, underscoring the importance of responsible disclosure practices in the cybersecurity ecosystem.
This incident serves as a reminder of the ongoing security challenges associated with widely used communication platforms. Regular patching and vigilant monitoring of user activity are crucial steps for organizations to protect against information disclosure and credential theft, especially when mobile applications are involved.