Description

Exposure of sensitive information to an unauthorized actor in Microsoft Teams Mobile allows an unauthorized attacker to disclose information over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-11T17:18:56.240Z",
  "pubdate": "2026-08-11T17:18:56.240Z",
  "executiveSummary": "An information disclosure vulnerability exists in Microsoft Teams Mobile, specifically related to the exposure of sensitive information to unauthorized actors.\nThis vulnerability allows an unauthorized attacker to leverage network exposure to intercept, disclose, or otherwise access confidential data intended to remain secure within the application context.\nThe affected product is Microsoft Teams Mobile, presenting significant risk implications for enterprise confidentiality, data privacy, and compliance if sensitive corporate communications or credentials are leaked.\nExploitation of this flaw enables malicious actors with network-level positioning to harvest sensitive information without requiring prior privileges or complex authentication hurdles, depending on the specific operational environment and network conditions.\nOrganizations utilizing Microsoft Teams Mobile face potential telemetry and data leakage risks over untrusted networks, necessitating immediate attention to vendor-supplied updates and network-layer security controls.",
  "technicalDetails": "The vulnerability stems from inadequate sanitization, insecure data handling, or improper encryption of sensitive data traversing the network layer within Microsoft Teams Mobile.\nThe vulnerable component involves the mobile application's data transmission architecture, which fails to adequately protect payloads against unauthorized interception or exposure during transport.\nExploitation occurs when an unauthorized attacker leverages network exposure—such as compromised local Wi-Fi networks, malicious hotspots, or unauthorized vantage points along the communication path—to observe, capture, or extract sensitive information transmitted by the client application.\nThe attack flow typically requires the attacker to establish a position on the network path between the Microsoft Teams Mobile client and remote endpoints.\nOnce positioned, the attacker monitors network traffic or exploits weaknesses in protocol implementation to capture plaintext or weakly protected data packets containing sensitive application information.\nThe root cause is rooted in flawed data protection mechanisms during network transit, allowing actors lacking authentication or elevated privileges to achieve unauthorized information disclosure.\nThe post-exploitation impact includes the exposure of proprietary organizational data, user credentials, session tokens, or internal communications, which can be leveraged for lateral movement, secondary attacks, or further espionage against enterprise resources.\nNetwork exposure is a primary vector, emphasizing the necessity of robust transport layer security and strict certificate validation to prevent unauthorized data exfiltration."
}