CVE-2026-21041 Overview
CVE-2026-21041 is an improper access control vulnerability in SamsungSEAgentService on Samsung mobile devices. The flaw permits local attackers to access sensitive information without requiring user interaction or elevated privileges. Samsung addressed the issue in the SMR Jul-2026 Release 1 security maintenance release.
The vulnerability was published to the NVD on 2026-07-10 and carries a CVSS 4.0 base score of 6.9. Exploitation requires local access to the affected device, but attack complexity is low and no authentication is needed. Successful exploitation results in disclosure of confidential data handled by the Samsung SE Agent Service component.
Critical Impact
A local attacker without privileges or user interaction can read sensitive information exposed by SamsungSEAgentService, undermining confidentiality on unpatched Samsung mobile devices.
Affected Products
- Samsung mobile devices running firmware prior to SMR Jul-2026 Release 1
- SamsungSEAgentService component on affected Samsung Android builds
- Samsung Security Maintenance Release (SMR) branches predating July 2026
Discovery Timeline
- 2026-07-10 - CVE-2026-21041 published to NVD
- 2026-07-10 - Samsung Mobile Security Update advisory released for July 2026
- 2026-07-10 - Last updated in NVD database
Technical Details for CVE-2026-21041
Vulnerability Analysis
The vulnerability resides in SamsungSEAgentService, a system service shipped in Samsung's Android distribution. The service exposes functionality without enforcing sufficient access control checks on local callers. As a result, an unprivileged process on the device can invoke exposed interfaces and retrieve data that should remain restricted to privileged system components.
Access control weaknesses in Android system services typically arise when a service registered with the system server fails to validate the caller's UID, package signature, or required permission. In this case, the missing enforcement lets any local application query the service and obtain sensitive information handled by the Samsung Enclave/Secure Element agent layer.
The issue is classified as Improper Access Control. Impact is limited to confidentiality, with no direct effect on integrity or availability of the device.
Root Cause
The root cause is missing or insufficient permission enforcement on exported interfaces of SamsungSEAgentService. The service does not adequately restrict which local callers may reach code paths that expose sensitive data. Samsung's July 2026 SMR introduces stricter caller validation to close the exposed surface.
Attack Vector
Exploitation requires an attacker to execute code locally on the device, typically through a malicious or compromised application installed by the user. Once running, the malicious process interacts with SamsungSEAgentService through its exposed IPC surface and retrieves sensitive information without needing additional Android permissions or user prompts.
No remote or network-based exploitation path is described. No public proof-of-concept exploit code was available at the time of publication, and the CVE is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS probability is 0.105%.
Because verified exploit code is not published, technical details beyond the vendor advisory are limited. Refer to the Samsung Mobile Security Update for authoritative information.
Detection Methods for CVE-2026-21041
Indicators of Compromise
- Installed third-party applications that bind to or invoke SamsungSEAgentService without a legitimate business purpose
- Android logcat entries showing repeated IPC calls from non-system UIDs to Samsung SE Agent interfaces
- Unexpected access patterns to Samsung secure element or agent-related content providers from unprivileged packages
Detection Strategies
- Inventory Samsung mobile devices and identify those still running builds predating SMR Jul-2026 Release 1
- Review mobile threat defense telemetry for applications that enumerate or interact with Samsung system services outside standard app behavior
- Correlate installed application signatures against known-good Samsung system packages to spot side-loaded or repackaged apps abusing local services
Monitoring Recommendations
- Enable enterprise mobile device management reporting for firmware and patch level to confirm SMR Jul-2026 Release 1 or later is applied
- Alert on installation of applications from unknown sources on managed Samsung devices
- Monitor for unusual data egress from mobile endpoints that could indicate exfiltration of information obtained through the flaw
How to Mitigate CVE-2026-21041
Immediate Actions Required
- Apply the Samsung SMR Jul-2026 Release 1 update, or any later maintenance release, to all affected Samsung mobile devices
- Restrict installation of applications to trusted sources such as the managed enterprise app catalog or Galaxy Store
- Audit installed applications on managed devices and remove any that lack a clear business justification
Patch Information
Samsung shipped the fix in the July 2026 Security Maintenance Release (SMR Jul-2026 Release 1). Details are documented in the Samsung Mobile Security Update advisory. Devices must receive the July 2026 or later security patch level to be considered remediated.
Workarounds
- Enforce mobile device management policies that block untrusted application installation until the patch is applied
- Require Samsung Knox attestation or equivalent posture checks before permitting access to corporate resources
- Educate users to avoid installing applications from outside official stores while awaiting the SMR update
# Verify Android security patch level on a Samsung device via ADB
adb shell getprop ro.build.version.security_patch
# Expected value: 2026-07-01 or later after applying SMR Jul-2026 Release 1
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
