Microsoft Teams Android Flaw Exposes Sensitive User Data

Key Takeaways

• A critical information disclosure vulnerability, CVE-2026-65812, has been identified in Microsoft Teams for Android.
• The flaw could expose sensitive user data, including credentials, under specific network conditions and with user interaction.
• The vulnerability is rated “Important” and specifically impacts Microsoft Teams for Android build 1416/1.0.0.2026133602.
• A patch is available via the Microsoft Teams app update channel on Google Play.

Microsoft Teams Android Flaw Exposes Sensitive User Data

Microsoft has recently addressed a significant security vulnerability, tracked as CVE-2026-65812, within its Teams application for Android. This flaw could potentially allow an attacker, who already possesses low-level privileges, to disclose sensitive user information, including authentication credentials.

The software giant officially disclosed the vulnerability on September 8, 2026, assigning it an “Important” severity rating. The issue specifically pertains to Microsoft Teams for Android and is categorized as an information disclosure vulnerability. Microsoft indicated that under particular network conditions, this weakness could enable sensitive data to be inadvertently embedded within transmitted information, thereby risking the exposure of credentials.

Analysis of the vulnerability suggests that an attacker could exploit this remotely over a network. The attack complexity is low, and the attacker requires minimal privileges. However, successful exploitation is contingent upon user interaction.

Details of the Teams for Android Vulnerability

While Microsoft did not specify the precise action a user would need to take for the vulnerability to be exploited, it implies that an attacker would likely need to persuade a Teams user to engage with specially crafted content. This could manifest as a malicious message, a shared resource, or another element controlled by the attacker.

The vulnerability is associated with CWE-201, known as “Insertion of Sensitive Information Into Sent Data.” This common class of software weakness occurs when an application inadvertently includes confidential data within the information it transmits. In the context of the Teams for Android issue, Microsoft confirmed that credentials could indeed be exposed if the flaw is successfully exploited. The security impact is confined to confidentiality, with Microsoft assigning a “High” impact rating for confidentiality, while integrity and availability impacts are rated as “None.”

This assessment indicates that the vulnerability is not expected to allow attackers to modify Teams data, execute arbitrary code, disrupt the application’s functionality, or deny access to services. Its primary danger lies in the potential exposure of authentication-related information, which could subsequently facilitate further attacks. Microsoft has stated that exploitation is considered “less likely,” with no known public disclosures, in-the-wild exploitation, or confirmed public proof-of-concept exploits reported to date. The specific affected build of Teams for Android is 1416/1.0.0.2026133602.

Microsoft has provided an official fix for this vulnerability, which is available through the Microsoft Teams app update channel on Google Play. The vulnerability was reported by Ofek Levin of Enclave through coordinated vulnerability disclosure, and Microsoft has credited the researcher for their contribution in identifying and helping to resolve the issue before any confirmed exploitation.

What You Should Do

• Organizations should prioritize updating Microsoft Teams on all managed Android devices immediately through the Google Play Store.
• Administrators must verify their mobile application update policies to ensure that users are running the patched version of Teams.
• Monitor for any unusual or suspicious authentication events, especially those originating from accounts that use Teams on Android devices.
• Security teams should review sign-in logs thoroughly for any suspicious access attempts, given the potential for credential exposure.

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