Microsoft has disclosed a high-severity information disclosure vulnerability in Microsoft Teams for Android, tracked as CVE-2026-42835, with a CVSS 3.1 base score of 8.1.
The flaw, published on June 9, 2026, could allow an authenticated attacker to remotely read portions of heap memory, potentially exposing sensitive user data without requiring physical access to the device.
The vulnerability stems from CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component. In practical terms, Teams for Android fails to properly sanitize specific elements before passing data to a downstream processing component.
Microsoft Teams for Android Vulnerability
According to Microsoft’s advisory, a successful exploit could allow an attacker to read small portions of heap memory, which in mobile collaboration apps commonly stores authentication tokens, session identifiers, and cached message fragments.
The vulnerability affects Microsoft Teams for Android from version 1.0.0 up to (but not including) build 1.0.76.2026111302, a vendor-confirmed, officially patched boundary.
The CVSS 3.1 vector AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H tells a particularly concerning story for enterprise defenders.
The combination of network reachability, low complexity, and no user interaction means that an attacker does not need physical access to devices, elaborate social engineering, or administrative credentials.
In large enterprise tenants with employees, contractors, guest users, and stale service accounts all holding valid low-privilege credentials, this bar is concerningly accessible.
Beyond raw heap memory, Teams for Android functions as a gateway to SharePoint files, meeting artifacts, channel histories, calendar metadata, phone calls, and incident-response workflows, Microsoft said.
A low-privilege attacker leveraging this flaw could harvest meeting titles, participant lists, internal file names, and organizational relationship metadata, all of which constitute high-value targeting intelligence for follow-on attacks.
Microsoft assessed this vulnerability as “Exploitation Less Likely” at the time of disclosure, with no public proof-of-concept code and no confirmed in-the-wild exploitation.
The Exploit Code Maturity is marked Unproven, and the Remediation Level is Official Fix Available, reducing the effective temporal score to 7.1.
Mitigation
Microsoft has released a security update through the Google Play Store. The patched build is identified as version 1.0.76.2026111302. Android users running Microsoft Teams should update immediately via the Play Store listing.
Enterprise security teams should also verify managed device compliance using MDM solutions to confirm the patched version has been deployed across all enrolled Android devices.
The broader takeaway from June 2026 Patch Tuesday is that Microsoft’s security perimeter now spans mobile clients, cloud services, and collaboration surfaces equally, and administrators treating “Microsoft patching” as synonymous with Windows Update.
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