CVE-2026-20976 is a vulnerability identified in Samsung Mobile's Galaxy Store application, specifically versions prior to 4.6.02. The root cause is improper input validation (CWE-20), which allows a local attacker to execute arbitrary scripts within the context of the Galaxy Store app. This vulnerability does not require any privileges, user interaction, or network access, as indicated by the CVSS 4.0 vector (AV:L/AC:L/PR:N/UI:N). The impact vector is local, meaning the attacker must have local access to the device, such as through physical access or via another compromised app or user account. The vulnerability could allow script execution that may lead to unauthorized actions within the app or device environment, potentially enabling data manipulation or privilege escalation chains. Although no known exploits have been reported in the wild, the presence of this flaw necessitates timely remediation. The vulnerability affects the integrity and potentially the confidentiality of the device environment, but does not directly impact availability. Samsung has not yet published patch links, but upgrading to version 4.6.02 or later is expected to resolve the issue. The vulnerability is categorized as medium severity with a CVSS score of 5.1, reflecting moderate risk due to local access requirements and limited scope of impact.

For European organizations, the primary impact of CVE-2026-20976 lies in the potential compromise of Samsung mobile devices running vulnerable versions of the Galaxy Store. If exploited, local attackers could execute arbitrary scripts, which might lead to unauthorized data access, manipulation, or further exploitation on the device. This could affect employees using Samsung devices for corporate communications, access to sensitive information, or mobile applications integrated with enterprise systems. The risk is heightened in environments where devices are shared, physically accessible by multiple users, or where endpoint security controls are weak. While the vulnerability does not allow remote exploitation, insider threats or malware with local access could leverage this flaw. The impact on confidentiality and integrity could lead to data breaches or unauthorized actions within corporate mobile environments. Organizations relying heavily on Samsung mobile devices, especially in sectors like finance, government, and critical infrastructure, should consider this vulnerability a moderate risk that requires prompt attention to prevent lateral movement or escalation within mobile endpoints.

1. Immediately update the Samsung Galaxy Store app to version 4.6.02 or later once the patch is available from Samsung to remediate the improper input validation issue. 2. Restrict local device access to trusted personnel only, minimizing the risk of local exploitation by unauthorized users. 3. Implement mobile device management (MDM) solutions to enforce app version controls and restrict installation of unauthorized applications. 4. Monitor device logs and behavior for any unusual script execution or app activity that could indicate exploitation attempts. 5. Educate users on the risks of granting local access to unknown apps or users and enforce strong device lock policies. 6. For organizations with sensitive data on mobile devices, consider additional endpoint protection solutions that can detect and block script-based attacks locally. 7. Coordinate with Samsung support channels to receive timely updates and advisories related to this vulnerability. 8. Conduct regular security assessments of mobile endpoints to identify and remediate any residual risks related to this or similar vulnerabilities.