CVE-2026-21078 Overview
CVE-2026-21078 is a data authenticity verification weakness in Samsung Smart Switch's trouble scanning mode. Versions prior to 3.7.72.6 fail to properly verify device identity during the scanning workflow. An attacker on an adjacent network can exploit this weakness to spoof a legitimate device and impersonate a trusted peer during a Smart Switch session.
The issue is tracked under CWE-345: Insufficient Verification of Data Authenticity. Samsung disclosed the flaw in its August 2026 security bulletin.
Critical Impact
Adjacent attackers can spoof device identity within Smart Switch trouble scanning sessions, potentially leading to unauthorized data transfer or trust relationships with attacker-controlled endpoints.
Affected Products
- Samsung Smart Switch versions prior to 3.7.72.6
- Samsung Smart Switch trouble scanning mode component
- Android devices running vulnerable Smart Switch builds
Discovery Timeline
- 2026-08-10 - CVE-2026-21078 published to NVD
- 2026-08-10 - Last updated in NVD database
- August 2026 - Samsung publishes security bulletin addressing the issue
Technical Details for CVE-2026-21078
Vulnerability Analysis
Samsung Smart Switch transfers content between Samsung devices and third-party devices during migration or diagnostic flows. Its trouble scanning mode assists users in identifying transfer or connectivity issues. In vulnerable versions, the mode does not sufficiently verify the authenticity of data received from a peer during the scan.
Because identity validation is incomplete, a peer on the same local or adjacent network segment can present forged identity data. Smart Switch accepts the identity as legitimate. This creates a trust boundary violation between the app and any device claiming to participate in a Smart Switch session.
Exploitation requires user interaction on the target device and low privileges on the attacker's side. The scope of impact extends beyond the vulnerable component itself, affecting confidentiality, integrity, and availability of subsequent system interactions that rely on the spoofed identity.
Root Cause
The root cause is insufficient verification of data authenticity [CWE-345] in the trouble scanning workflow. Smart Switch relies on identity attributes exchanged during the scan without cryptographically validating that they belong to the claimed device. No authenticated channel or signed identity proof is required before the app treats the peer as trusted.
Attack Vector
The attack requires adjacent network access, meaning the attacker must be present on the same Wi-Fi network, Bluetooth range, or comparable link-layer domain as the victim. The attacker initiates or responds to a Smart Switch trouble scanning session and supplies crafted identity data that mimics a legitimate Samsung device. When the victim accepts the session prompt, the app treats the attacker-controlled endpoint as an authenticated peer.
Because no verified exploit code is publicly available, technical exploitation details should be reviewed in the Samsung Security Bulletin.
Detection Methods for CVE-2026-21078
Indicators of Compromise
- Unexpected Smart Switch pairing or transfer sessions originating from unknown peers on local Wi-Fi or Bluetooth networks
- Devices reporting Smart Switch trouble scanning activity outside of user-initiated migrations
- Duplicate or spoofed Samsung device identifiers appearing during scans
Detection Strategies
- Monitor mobile device management (MDM) telemetry for Smart Switch app versions older than 3.7.72.6
- Inspect network flows on enterprise Wi-Fi for anomalous device-discovery broadcasts consistent with Smart Switch peer advertisement
- Correlate user reports of unusual Smart Switch prompts with adjacent unknown devices on the same segment
Monitoring Recommendations
- Track Smart Switch version inventory across managed Samsung devices
- Alert on new or rogue devices joining trusted wireless segments used by executives or high-value users
- Log Bluetooth and Wi-Fi Direct pairing events on managed endpoints where feasible
How to Mitigate CVE-2026-21078
Immediate Actions Required
- Update Samsung Smart Switch to version 3.7.72.6 or later on all managed Android devices
- Advise users to avoid initiating Smart Switch trouble scanning on untrusted networks such as public Wi-Fi
- Enforce version compliance for Smart Switch through MDM policies
Patch Information
Samsung addressed CVE-2026-21078 in Smart Switch version 3.7.72.6. Refer to the Samsung Security Bulletin (August 2026) for the authoritative fix reference and distribution details.
Workarounds
- Disable or uninstall Smart Switch on devices that cannot be updated to the fixed version
- Restrict Smart Switch use to isolated, trusted networks during device migrations
- Require user verification of the peer device identifier before accepting any Smart Switch session prompt
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
