CVE-2026-21084 in SmartThings
Summary
by MITRE • 08/10/2026
Improper access control in SmartThings prior to version 1.8.47.24 allows local attackers to access sensitive information.
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Analysis
by VulDB Data Team • 08/10/2026
This vulnerability represents a critical weakness in the access control mechanisms of Samsung SmartThings smart home platform, specifically affecting versions prior to 1.8.47.24. The flaw stems from insufficient authorization checks that allow local attackers with physical access to the device to bypass normal security boundaries and gain unauthorized access to sensitive information stored within the system. The vulnerability manifests due to inadequate validation of user permissions and lack of proper authentication enforcement at multiple levels within the SmartThings architecture, creating opportunities for privilege escalation and data exposure.
The technical implementation of this flaw occurs when local attackers exploit missing access control checks that should normally prevent unauthorized data retrieval operations. Attackers can leverage their physical presence on the device to access configuration files, user credentials, device pairing information, and other sensitive metadata that should remain protected from local users. This type of vulnerability typically falls under CWE-284 which addresses improper access control issues, where the system fails to properly enforce authorization mechanisms for accessing resources.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates potential pathways for attackers to escalate their privileges and gain deeper system access. Local attackers can exploit this weakness to extract sensitive configuration data, potentially enabling them to compromise other connected devices within the smart home ecosystem or establish persistent access points. The vulnerability particularly affects environments where physical security is compromised, such as shared living spaces or commercial properties where unauthorized individuals might gain access to SmartThings-enabled devices.
Security professionals should implement multiple layers of protection to address this vulnerability effectively. Immediate remediation requires updating affected SmartThings installations to version 1.8.47.24 or later, which includes enhanced access control mechanisms and proper authorization enforcement. Network segmentation strategies should be implemented to limit local network access to smart home devices, while regular security assessments should verify that proper access controls are maintained across all system components. Additionally, organizations should consider implementing device integrity monitoring solutions that can detect unauthorized access attempts and alert administrators to potential exploitation of such vulnerabilities.
The broader implications of this vulnerability align with ATT&CK technique T1068 which covers 'Exploitation for Privilege Escalation' and T1566 which addresses 'Phishing for Information'. The local access requirement makes this particularly relevant to physical security considerations within enterprise environments, where the attack surface expands beyond traditional network-based threats to include physical access points. Organizations should also consider implementing device lockdown procedures and ensuring that only authorized personnel have physical access to smart home control devices, as this vulnerability specifically targets scenarios where attackers can manipulate or observe device behavior directly.