A newly disclosed Microsoft Teams for Android vulnerability could allow authenticated attackers to access sensitive information, prompting Microsoft to urge users and organizations to install the latest security update immediately.
Quick Summary – TLDR:
- Microsoft has disclosed a high severity vulnerability in Microsoft Teams for Android, tracked as CVE-2026-42835.
- The flaw carries a CVSS score of 8.1 and could allow attackers to disclose sensitive information remotely.
- Successful exploitation may expose authentication tokens, session data, chat content, and cached information stored in memory.
- Microsoft has released a fix, and organizations are advised to update Teams for Android to the latest version as soon as possible.
What Happened?
Microsoft has revealed details of CVE-2026-42835, a high severity information disclosure vulnerability affecting Microsoft Teams for Android. The issue could allow an authenticated attacker with low privileges to remotely access sensitive information without requiring any user interaction.
The company has already released a security update through the Google Play Store and is encouraging users and enterprise administrators to deploy the patched version immediately.
Microsoft Details a Serious Teams Android Vulnerability
The vulnerability was publicly disclosed on June 9, 2026, and has been classified as an Important security issue by Microsoft. It carries a CVSS v3.1 base score of 8.1, placing it among the more significant flaws addressed in Microsoft’s latest security updates.
According to Microsoft’s advisory, the issue originates from improper neutralization of special elements in output used by a downstream component, a weakness categorized under CWE 74. This type of flaw occurs when user supplied data is not properly sanitized before being processed by another component, potentially leading to unintended information exposure.
The vulnerability affects Microsoft Teams for Android versions 1.0.0 through versions before 1.0.76.2026111302. Microsoft confirmed that build 1.0.76.2026111302 contains the necessary security fixes.
Why Security Teams Are Paying Attention?
Several characteristics of the vulnerability make it particularly concerning for enterprise environments.
The flaw is remotely exploitable over a network and requires only low privileges. Attackers do not need administrative access, physical access to a device, or user interaction to trigger the vulnerability. The attack complexity is also rated low, meaning exploitation does not require sophisticated techniques or extensive knowledge of the target environment.
Microsoft stated that successful exploitation could allow attackers to read small portions of heap memory. While that may sound limited, heap memory often contains valuable runtime information used by applications.
Potentially exposed data may include:
- Authentication tokens
- Session identifiers
- Cached credentials
- Cached message fragments
- Chat related content
- Other sensitive communication artifacts
Even limited access to such information could help attackers gather intelligence or support future attacks against an organization.
Potential Impact on Enterprise Environments
Microsoft Teams serves as a central collaboration platform for many businesses, connecting employees to meetings, files, conversations, and productivity tools.
Because Teams integrates with services such as SharePoint, meeting records, channel histories, calendars, and communication workflows, exposed information could provide valuable insight into an organization’s internal operations.
Security researchers noted that attackers may potentially gain access to information such as:
- Meeting titles
- Participant lists
- Internal file names
- Organizational relationship metadata
Although the vulnerability does not directly impact data integrity, Microsoft’s CVSS assessment indicates a high impact on confidentiality and availability, making it a significant concern for organizations handling sensitive business communications.
No Active Exploitation Reported Yet
The good news is that Microsoft currently considers exploitation of the vulnerability to be less likely. The company stated that there is no evidence of active attacks in the wild and no publicly available proof of concept exploit at the time of disclosure.
The exploit code maturity remains classified as unproven, which helped lower the temporal score to 7.1. However, security teams are still being encouraged to prioritize patching because the vulnerability’s low complexity and minimal privilege requirements make it an attractive target if exploitation methods emerge.
Microsoft Releases a Fix
Microsoft has already issued a security update through the Google Play Store. Organizations should ensure that all managed Android devices are running Microsoft Teams version 1.0.76.2026111302 or later.
In addition to applying the update, security teams are encouraged to:
- Verify device compliance through MDM platforms.
- Enforce least privilege access policies.
- Monitor Teams related activity for unusual behavior.
- Review logs for signs of unauthorized data access.
- Restrict unnecessary permissions where possible.
The vulnerability was responsibly disclosed by Ofek Levin of Enclave through Microsoft’s coordinated vulnerability disclosure program.
SQ Magazine Takeaway
I believe this vulnerability highlights a growing reality for enterprise security teams. Many organizations focus heavily on protecting servers, cloud infrastructure, and desktop systems, while mobile collaboration apps often receive less attention.
Microsoft Teams has become a critical business platform, and even a flaw that exposes small portions of memory can create valuable opportunities for attackers. The fact that Microsoft has already released a fix is encouraging, but organizations should move quickly because collaboration tools continue to be high value targets for cybercriminals.
