CVE-2025-58485 is a vulnerability classified under CWE-20 (Improper Input Validation) affecting Samsung Internet browser versions prior to 29.0.0.48. The flaw allows local attackers with limited privileges to inject arbitrary scripts into the browser environment. This occurs because the browser fails to properly validate input data, enabling script injection vectors that can compromise the confidentiality of user data. The vulnerability does not require user interaction, which increases the risk of silent exploitation once local access is obtained. However, the attack vector is local, meaning the attacker must have some level of access to the device, such as through physical access or a compromised local user account. The CVSS 3.1 base score is 5.5, reflecting medium severity, with the vector string indicating low attack complexity, low privileges required, no user interaction, and impact limited to confidentiality. There are no known exploits in the wild, and no official patches or updates are linked yet, but the issue is publicly disclosed and assigned by Samsung Mobile. This vulnerability primarily threatens the confidentiality of sensitive information accessible through the browser, such as cookies, session tokens, or stored credentials, but does not affect integrity or availability of the system or browser. The lack of user interaction requirement makes it more dangerous in scenarios where local access is already compromised or where malicious apps may leverage this flaw to escalate data theft capabilities.

For European organizations, the primary impact is the potential leakage of sensitive information stored or accessible via Samsung Internet on mobile devices. This could include corporate credentials, session tokens, or confidential browsing data. Since the vulnerability requires local access and limited privileges, the risk is higher in environments where device physical security is weak or where insider threats exist. Mobile workforce members using Samsung Internet on corporate or personal devices could be targeted to gain unauthorized access to confidential information. The confidentiality breach could lead to further attacks such as identity theft, unauthorized access to corporate resources, or espionage. However, the vulnerability does not affect system integrity or availability, limiting the scope of damage to data exposure rather than system disruption. Organizations relying heavily on Samsung mobile devices for sensitive communications or transactions are at increased risk. The absence of known exploits reduces immediate threat but does not eliminate the risk of future weaponization.

To mitigate this vulnerability, European organizations should prioritize updating Samsung Internet to version 29.0.0.48 or later once available, as this will contain the necessary input validation fixes. Until patches are deployed, organizations should enforce strict physical security controls to prevent unauthorized local access to mobile devices. Implement mobile device management (MDM) solutions to restrict installation of untrusted applications that could exploit local access. Educate users on the risks of installing unknown apps and the importance of device security. Consider disabling or limiting use of Samsung Internet on corporate devices if alternative browsers with better security postures are available. Regularly audit devices for signs of compromise or unauthorized access. Additionally, monitor for updates from Samsung and apply security advisories promptly. Network segmentation and use of VPNs can reduce exposure of sensitive data even if local browser compromise occurs. Finally, implement strong authentication and encryption for sensitive applications accessed via mobile browsers to reduce the impact of potential data leakage.