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Vulnerability Database/CVE-2026-21136

CVE-2026-21136: Smart Switch Authorization Bypass Vulnerability

CVE-2026-21136 is an authorization bypass flaw in Smart Switch that allows physical attackers to invoke unauthorized application restore processes. This post explains its impact, affected versions, and mitigation steps.

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CVE-2026-21136 Overview

CVE-2026-21136 is an improper authorization vulnerability in Samsung Smart Switch prior to version 3.7.73. The flaw allows a physical attacker to invoke the application restore process without proper authorization checks. Samsung Smart Switch is a data migration and backup utility used to transfer content between mobile devices. An attacker with physical access to an unlocked or accessible device can trigger a restore operation, potentially overwriting user data or injecting attacker-controlled application state onto the device.

Critical Impact

Physical attackers can invoke the Smart Switch restore process without authorization, affecting the confidentiality and integrity of application data on the target device.

Affected Products

  • Samsung Smart Switch versions prior to 3.7.73
  • Samsung mobile devices with Smart Switch installed
  • Android devices using Samsung's data migration utility

Discovery Timeline

  • 2026-10-12 - CVE-2026-21136 published to NVD
  • 2026-10-15 - Last updated in NVD database

Technical Details for CVE-2026-21136

Vulnerability Analysis

The vulnerability is categorized as an improper authorization flaw in the Samsung Smart Switch application. The restore workflow does not adequately verify that the entity invoking the operation is authorized to do so. An attacker with physical access to the device can trigger the application restore process directly, bypassing intended authorization controls.

Successful exploitation impacts the confidentiality and integrity of application data on the target device. Because the attack vector is physical, exploitation requires hands-on interaction with the device rather than remote network access.

Root Cause

The root cause is a missing or insufficient authorization check within the Smart Switch restore invocation path. The application exposes functionality to initiate a restore without validating that the requesting context has the privileges necessary to perform the operation on behalf of the device owner.

Attack Vector

Exploitation requires physical access to the target device. The attacker interacts with the Smart Switch application or an exposed interface that invokes the restore routine. Because no user interaction or privileges beyond physical access are required, an attacker in possession of an unlocked or accessible device can trigger the restore flow and influence stored application data.

No verified public proof-of-concept code is available for CVE-2026-21136. Refer to the Samsung Mobile Security Advisory for vendor technical details.

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Detection Methods for CVE-2026-21136

Indicators of Compromise

  • Unexpected invocations of the Samsung Smart Switch restore process on managed mobile devices
  • Application data changes or restorations that do not correlate with user-initiated actions
  • Smart Switch application logs showing restore operations outside of normal migration windows

Detection Strategies

  • Audit mobile device management (MDM) logs for Smart Switch activity on devices running versions prior to 3.7.73
  • Alert on restore operations occurring on devices that are not in a provisioning or migration state
  • Correlate physical access events (such as device unlocks or USB connections) with Smart Switch process activity

Monitoring Recommendations

  • Track Smart Switch version inventory across the mobile device fleet to identify unpatched endpoints
  • Monitor for anomalous application restore events via MDM telemetry
  • Review device access logs for unauthorized physical handling events in high-sensitivity environments

How to Mitigate CVE-2026-21136

Immediate Actions Required

  • Update Samsung Smart Switch to version 3.7.73 or later on all affected Samsung mobile devices
  • Enforce strong device lock screens, including PIN, password, or biometric authentication, to limit physical access
  • Restrict physical access to Samsung mobile devices in sensitive environments

Patch Information

Samsung addressed CVE-2026-21136 in Smart Switch version 3.7.73. The fix enforces authorization checks on the application restore invocation path. Review the Samsung Mobile Security Advisory for the official October 2026 patch details and distribution guidance.

Workarounds

  • Disable or uninstall Smart Switch on devices where migration functionality is not required
  • Apply MDM policies that block or restrict Smart Switch execution on managed Samsung devices
  • Require device encryption and screen lock enforcement to raise the barrier for physical exploitation

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

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