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Microsoft has revealed a notable security vulnerability in Microsoft Teams for Android that could permit an authenticated assailant to reveal confidential data over a network. The defect, identified as CVE-2026-42835, was officially announced on June 9, 2026, and has been rated Important in severity.
The vulnerability originates from improper handling of special characters in output utilized by a downstream component, categorized under CWE-74 (Injection).
Per Microsoft’s advisory, the flaw enables an authorized intruder to disclose data remotely, without needing any user interaction.
This defect has a CVSS 3.1 base score of 8.1 (temporal score: 7.1), indicating its substantial risk. The attack vector is Network (AV:N), confirming the vulnerability can be exploited remotely over the internet.
With an attack complexity rated as Low (AC:L), an attacker does not need extensive knowledge of the target system and can achieve consistent exploitation success with a tailored payload against the vulnerable element.
Microsoft confirmed that a successful exploit could enable an attacker to read small segments of heap memory. While the extent of disclosed data may seem limited, heap memory can harbor sensitive runtime information, including authentication tokens, session details, or cached credentials, making even partial exposure a significant issue in corporate settings.
The CVSS metrics denote a high effect on both Confidentiality and Availability, with no impact on integrity. The Privileges Required metric is rated Low, indicating that any authenticated user, including those with low privileges, could potentially activate the vulnerability.
Microsoft’s exploitability assessment categorizes this vulnerability as Exploitation Less Likely. The flaw has not been disclosed publicly and has not been observed in active exploitation at the time of release. The maturity of exploit code is marked as Unproven, and an official remedy is already accessible.
Microsoft has issued a security update for Microsoft Teams for Android, obtainable through the Google Play Store. Users and enterprise administrators are highly encouraged to update the application immediately via the official Microsoft Teams listing on Google Play.
Organizations depending on Teams for internal communication should emphasize this update, particularly considering the application’s extensive use in managing sensitive business discussions and file exchanges.
The vulnerability was responsibly disclosed by Ofek Levin of Enclave through Microsoft’s coordinated vulnerability disclosure program.
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