Microsoft Teams Android Flaw Could Let Attackers Disclose Sensitive Information

Microsoft has disclosed a high-severity information disclosure vulnerability affecting its Teams application for Android, tracked as CVE-2026-42835.

The flaw, publicly released on June 9, 2026, has been assigned a CVSS v3.1 base score of 8.1, categorizing it as an “Important” severity issue.

According to Microsoft’s advisory, the vulnerability stems from improper neutralization of special elements in output used by a downstream component, mapped to CWE-74, a commonly associated injection-related weakness.

Microsoft Teams Android Flaw

The vulnerability could allow an authenticated attacker to access sensitive information within the Teams environment without requiring user interaction.

The attack vector is network-based (AV: N), with low attack complexity (AC:L) and requires only low privileges (PR:L), making exploitation relatively straightforward in scenarios where an attacker already has limited access to a target environment.

Notably, the flaw does not require user interaction (UI:N), increasing its potential impact in enterprise deployments where Teams is widely used for communication and collaboration.

Successful exploitation of CVE-2026-42835 could result in unauthorized disclosure of confidential data, including chat content, tokens, or other sensitive communication artifacts handled by the application.

While the vulnerability does not directly affect integrity (I:N), it poses a high risk to confidentiality (C:H) and availability (A:H), suggesting that attackers may exploit the flaw to disrupt services or extract data at scale.

From a technical perspective, CWE-74 vulnerabilities typically arise when user-controlled input is not properly sanitized before being processed by downstream components, such as APIs or rendering engines.

In the context of Microsoft Teams for Android, this could involve maliciously crafted inputs being injected into communication workflows, potentially exposing backend responses or sensitive application data.

Although Microsoft has not disclosed detailed exploitation techniques, the presence of a public CVE and the relatively high CVSS score indicate a significant risk for organizations relying on Teams mobile deployments.

The exploitability sub-score remains unproven (E:U), but given the low complexity and lack of user interaction requirements, security teams should treat this vulnerability as a priority.

Organizations are strongly advised to apply the latest security updates provided by Microsoft and monitor mobile device management (MDM) systems for anomalous behavior related to Teams usage.

Additionally, restricting unnecessary permissions, enforcing least-privilege access, and monitoring API interactions can help mitigate potential exploitation attempts.

Security teams should also review logs for unusual access patterns or data exposure incidents that could indicate attempted exploitation. As collaboration platforms remain prime targets for attackers, vulnerabilities such as CVE-2026-42835 underscore the importance of securing mobile endpoints in enterprise environments.

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