Microsoft has issued a security patch for a serious vulnerability in Microsoft Teams on Android, tracked as CVE-2026-65812, that could let authorized attackers expose sensitive data—including user credentials. The flaw, disclosed on September 8, 2026, is rated “Important” and categorized as an information disclosure vulnerability. It primarily impacts Android builds of Teams. Recent versions are vulnerable to data egress that could include authentication details.
What Makes This Vulnerability Dangerous
The issue stems from insertion of sensitive information into data that gets sent—known as CWE-201. In Teams for Android, an attacker who already has low-level privileges and gains some form of access over a network might coax a user into interacting with crafted content (such as a malicious message or shared link). If successful, this could lead to credentials being exposed.
Microsoft’s risk assessment labels the confidentiality impact as high, while integrity and availability remain unaffected. That means data may leak, but the vulnerability does not allow altering code, corrupting files, or stopping services. The flaw requires user interaction. There is no proof yet of exploitation in the wild or of a working public proof-of-concept.
What You Should Do Now
The vulnerability affects Teams for Android build 1416/1.0.0.2026133602. Microsoft has pushed a fix via the Google Play-delivered app update. It’s essential for organizations—and individuals—to ensure their Teams app is updated to this patched version as soon as possible.
Admins should review mobile app update policies to confirm that managed devices are receiving the patch. They should check device inventories to see who’s running the affected build and monitor sign-in logs for signs of unusual authentication behavior.
The vulnerability was reported by researcher Ofek Levin of Enclave through coordinated disclosure, allowing Microsoft to investigate and address the issue before any confirmed incidents.
This flaw arrives amid growing concerns over mobile communication tools as targets. Teams, a predominantly workplace collaboration platform, is trusted to handle sensitive chats, voice, file sharing, and video conferencing—so exposure of credentials within its Android client could open doors to phishing, account takeovers, and broader breaches. Even a vulnerability marked as “Important” can have cascading effects in enterprise environments.
What to watch: whether any exploits emerge that leverage this flaw in real-world attacks; how quickly organizations patch; and whether Microsoft adjusts its security labeling or response practices. For now, the recommendation is clear: update Teams on Android immediately and monitor authentication logs carefully.
