CVE-2025-58485 is a vulnerability identified in Samsung Internet browser versions prior to 29.0.0.48, stemming from improper input validation (CWE-20). This flaw allows local attackers with limited privileges to inject arbitrary scripts into the browser environment. The vulnerability is classified with a CVSS 3.1 base score of 5.5, indicating medium severity. The attack vector is local (AV:L), requiring the attacker to have local access and privileges (PR:L), but no user interaction is needed (UI:N). The scope is unchanged (S:U), and the impact affects confidentiality (C:H) but not integrity (I:N) or availability (A:N). The improper input validation likely occurs in the processing of local data or IPC mechanisms within the browser, enabling script injection that could lead to data leakage or unauthorized data access within the browser context. No known exploits are reported in the wild, and no patches or updates are linked yet, though the fixed version is identified as 29.0.0.48 or later. This vulnerability primarily threatens confidentiality by exposing sensitive browsing data or credentials accessible to the injected script. Since exploitation requires local access and privileges, remote exploitation is not feasible, limiting the attack surface to scenarios where an attacker has already compromised or gained access to the device. The vulnerability highlights the importance of robust input validation in browser components handling local data or inter-process communication.

For European organizations, the primary impact is the potential exposure of sensitive information through script injection in Samsung Internet browsers on employee mobile devices. Since the vulnerability requires local access and privileges, it is most relevant in environments where devices might be physically accessed by unauthorized personnel or where malware with limited privileges is present. Confidentiality breaches could lead to leakage of corporate credentials, session tokens, or sensitive browsing data, potentially facilitating further attacks such as lateral movement or phishing. The vulnerability does not affect data integrity or system availability, so direct disruption or data manipulation is unlikely. However, the presence of injected scripts could be leveraged as a foothold for more complex attacks. Organizations with mobile device management (MDM) policies that include Samsung devices should prioritize patching and access controls. The lack of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits targeting this vulnerability. The impact is heightened in sectors with sensitive data, such as finance, healthcare, and government, where confidentiality is paramount.

1. Update Samsung Internet browser to version 29.0.0.48 or later as soon as the patch becomes available to eliminate the vulnerability. 2. Enforce strict local device access controls, including strong authentication and physical security measures, to prevent unauthorized local access. 3. Implement mobile device management (MDM) solutions to monitor and control application versions and enforce timely updates. 4. Restrict installation of untrusted applications and monitor for malware that could gain local privileges on mobile devices. 5. Educate users about the risks of local device compromise and encourage secure handling of devices, especially in shared or public environments. 6. Employ runtime application self-protection (RASP) or endpoint detection and response (EDR) tools capable of detecting anomalous script injection or browser behavior. 7. Regularly audit device configurations and installed software to ensure compliance with security policies. 8. Consider network segmentation and VPN usage to limit exposure of sensitive data even if local script injection occurs. These measures collectively reduce the likelihood of exploitation and limit the potential damage from this vulnerability.