CVE-2025-55618 is a vulnerability identified in the Hyundai Navigation App version STD5W.EUR.HMC.230516.afa908d. The issue arises from improper input validation in the profile name field, where an attacker can inject malicious HTML payloads. These payloads are subsequently rendered by the application, indicating a classic stored cross-site scripting (XSS) or HTML injection vulnerability. This flaw allows an attacker to execute arbitrary HTML or potentially JavaScript code within the context of the navigation app's user interface. Such execution can lead to unauthorized actions such as session hijacking, data theft, or manipulation of app behavior. The vulnerability does not specify affected versions beyond the named build, and no patches or known exploits have been reported at the time of publication. The lack of a CVSS score suggests the vulnerability is newly disclosed and not yet fully assessed. However, the core issue is the failure to sanitize or encode user-supplied input in the profile name field, which is a critical security oversight in application design. Since the navigation app likely runs on embedded systems or mobile devices within Hyundai vehicles, exploitation could impact in-car navigation and related services, potentially affecting driver safety or privacy if leveraged maliciously.

For European organizations, particularly automotive companies, dealerships, and service providers using Hyundai vehicles equipped with this navigation app, the vulnerability poses several risks. Exploitation could allow attackers to inject malicious content that compromises the integrity and confidentiality of user data stored or processed by the app. This could lead to unauthorized access to personal information or manipulation of navigation data. While the vulnerability primarily affects the app's user interface, if combined with other flaws, it could facilitate broader attacks on vehicle systems or connected services. The impact extends to end-users who rely on the navigation system for safe and accurate routing, potentially undermining trust in Hyundai's software security. Additionally, organizations responsible for fleet management or connected vehicle services in Europe could face operational disruptions or reputational damage if this vulnerability is exploited. Given the increasing regulatory focus on automotive cybersecurity in Europe, failure to address such vulnerabilities could also result in compliance issues under frameworks like UNECE WP.29 or GDPR if personal data is compromised.

To mitigate this vulnerability, Hyundai and affected organizations should prioritize the following actions: 1) Implement robust input validation and output encoding on the profile name field to prevent HTML or script injection. This includes sanitizing user inputs to strip or neutralize HTML tags and special characters before rendering. 2) Release and deploy a security patch or updated app version that addresses this input handling flaw. 3) Conduct thorough security testing, including static and dynamic analysis, to identify and remediate similar injection points within the app. 4) Educate users and administrators about the risk of entering untrusted data into profile fields and encourage cautious use until patches are applied. 5) Monitor for any signs of exploitation attempts in vehicle telemetry or app logs, enabling rapid incident response. 6) For organizations managing fleets, implement network segmentation and restrict app update sources to trusted channels to reduce exposure. 7) Coordinate with Hyundai’s security team to receive timely updates and advisories. These steps go beyond generic advice by focusing on secure coding practices, proactive patch management, and operational controls tailored to the automotive navigation context.