CVE-2026-21037: Samsung Members Input Validation Flaw – Patch Guidance

Technical summary

CVE-2026-21037 is an input validation vulnerability in Samsung Members. The flaw permits a local, unprivileged user to craft malicious input that bypasses validation controls, enabling arbitrary URL access and arbitrary activity execution within the Samsung Members process context. The attack vector is local (AV:L), requires low attack complexity (AC:L), and a low-privilege user account (PR:L). No user interaction is required. The vulnerability has high confidentiality and integrity impact, with no availability impact.

Business impact

This vulnerability enables privilege escalation on Samsung devices. Because Samsung Members runs with application-level privileges, a compromised or malicious local account can intercept sensitive operations, redirect authentication flows, or trigger actions under the Samsung Members identity. For organizations managing Samsung devices (e.g., BYOD programs, retail, or corporate-owned fleets), this increases the risk of unauthorized access to Samsung services and potential lateral movement within enterprise environments.

Affected systems

Samsung Members application versions prior to 5.8.01.5 are affected. The vulnerability is local-only, so it requires existing device access. All Samsung devices running the vulnerable Samsung Members version are at risk if they contain additional Samsung services or integrations that trust the Samsung Members process.

Exploitability

Exploitation requires local access and valid user credentials on the device—a moderate barrier for external threats. However, for insider threats, compromised local accounts, or physical device access scenarios, exploitation is straightforward. There is no known public exploit, and the flaw has not been added to CISA's Known Exploited Vulnerabilities catalog, suggesting limited active weaponization at publication.

Remediation

Update Samsung Members to version 5.8.01.5 or later. Samsung has released this patched version to address the input validation flaw. Users should enable automatic app updates through the Google Play Store or Samsung Galaxy Store to receive the patch seamlessly.

Patch guidance

Verify that Samsung Members is updated to 5.8.01.5 or later through Settings > Apps or the Play Store. Organizations with managed Samsung device fleets should use Mobile Device Management (MDM) solutions to enforce the update across enrolled devices. Test the update in a non-production environment first to confirm compatibility with any Samsung service integrations in your environment.

Detection guidance

Monitor for unexpected URL access or activity launches originating from the Samsung Members process on managed devices. Review device logs for Samsung Members privilege escalation attempts or unusual inter-process communication. Endpoint Detection and Response (EDR) tools can flag suspicious activity patterns from the Samsung Members app. Consider blocking Samsung Members from accessing sensitive network endpoints until patching is complete, if your security posture allows.

Why prioritize this

This vulnerability rates HIGH (CVSS 7.1) due to the combination of high confidentiality and integrity impact on a process that runs with application privileges. Although it requires local access, the low complexity and the prevalence of Samsung devices across consumer and enterprise environments warrant prompt patching. Organizations should deprioritize this only if they have strong endpoint controls that prevent unauthorized local access.

Risk score, explained

The CVSS 3.1 score of 7.1 reflects high impact (C:H, I:H) constrained by a local attack vector and a requirement for an authenticated user. The score does not account for organizational context—enterprises managing large Samsung device populations or those with high-value Samsung service integrations should consider this more urgent than the base score alone suggests.

Frequently asked questions