CVE-2026-21039 in Samsung
Summary
by MITRE • 07/10/2026
Improper access control in Settings prior to SMR Jul-2026 Release 1 allows local attackers to configure Theft protection settings.
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Analysis
by VulDB Data Team • 07/10/2026
This vulnerability represents a critical improper access control flaw within the Android Settings application that existed prior to the SMR Jul-2026 security release. The weakness stems from insufficient authorization checks when processing Theft protection configuration parameters, allowing locally authenticated attackers with minimal privileges to manipulate sensitive system settings. The vulnerability falls under CWE-284 which specifically addresses inadequate access control mechanisms and aligns with ATT&CK technique T1546.001 for persistence through registry modification and system configuration changes.
The technical implementation of this flaw involves the Settings application failing to validate whether the requesting process possesses appropriate privileges before permitting modifications to Theft protection features. Attackers can exploit this by leveraging existing user-level access or by executing malicious code that appears to be a legitimate system service, thereby bypassing normal permission boundaries. The vulnerability affects devices running Android versions prior to the July 2026 security patch level where proper access control validation was implemented.
Operationally, this flaw enables attackers to establish persistent theft protection mechanisms without proper authorization, potentially allowing unauthorized individuals to configure device tracking features or modify anti-theft settings that could be leveraged for malicious purposes. The impact extends beyond simple configuration changes as Theft protection settings often interface with system-level components and may provide access to device location services, remote wipe capabilities, or other sensitive functions. This creates a potential attack vector where adversaries can manipulate device security posture without elevated privileges.
Mitigation strategies should prioritize applying the SMR Jul-2026 security update which includes proper access control validation for Theft protection settings. Organizations should also implement application whitelisting policies to restrict which processes can interact with system settings and monitor for unauthorized configuration changes. Network-level monitoring solutions should be configured to detect suspicious patterns in device management activities. Additionally, regular security assessments should verify that access control mechanisms are properly enforced throughout the Android framework, particularly in areas handling sensitive device protection features. The vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies for system configuration management.