CVE-2025-41406 is a cross-site scripting (XSS) vulnerability affecting all versions of the wivia 5 product developed by UCHIDA YOKO CO., LTD. This vulnerability allows an attacker to execute arbitrary scripts in the web browser of a moderator user when they connect to the affected device and perform a specific operation. The vulnerability is classified as a reflected or stored XSS, where malicious input is not properly sanitized or escaped before being rendered in the web interface. The CVSS v3.0 base score is 5.4, indicating a medium severity level. The vector string (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) shows that the attack can be performed remotely over the network with low attack complexity, requires privileges of a user with some level of authorization (moderator), and requires user interaction (the moderator must perform the triggering operation). The vulnerability impacts confidentiality and integrity by allowing script execution, potentially leading to session hijacking, credential theft, or unauthorized actions performed in the context of the moderator user. Availability is not impacted. The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component, likely the web browser environment. No known exploits in the wild have been reported yet, and no patches or mitigations have been linked at the time of publication. The vulnerability was assigned by JPCERT and published on May 30, 2025.

For European organizations using wivia 5 devices, this vulnerability poses a risk primarily to the confidentiality and integrity of their web management interfaces. Since the vulnerability requires a moderator user to interact with the malicious payload, the threat is significant in environments where privileged users access the device's web interface regularly. Exploitation could lead to session hijacking, unauthorized command execution, or theft of sensitive information such as credentials or configuration data. This could facilitate further lateral movement or persistent access within the network. Given that wivia 5 is a specialized product, the impact depends on its deployment scale in European enterprises or government agencies. If used in critical infrastructure or sensitive environments, the risk is elevated. The lack of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers often weaponize such vulnerabilities rapidly after disclosure. The medium CVSS score reflects the moderate ease of exploitation combined with the requirement for user interaction and privileges. European organizations must consider this vulnerability in their risk assessments, particularly those with privileged users managing wivia 5 devices.

1. Immediate mitigation should include restricting access to the wivia 5 web interface to trusted networks and users only, minimizing exposure to potential attackers. 2. Enforce the principle of least privilege by limiting moderator user accounts and their usage. 3. Educate and alert moderator users about the risk of interacting with untrusted or suspicious inputs when managing the device. 4. Monitor web interface logs and network traffic for unusual activities that could indicate exploitation attempts. 5. Apply any vendor-provided patches or updates as soon as they become available. 6. If patches are not yet available, consider deploying web application firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting the wivia 5 interface. 7. Conduct regular security assessments and penetration tests focusing on the web management interfaces to identify and remediate similar vulnerabilities proactively. 8. Implement multi-factor authentication (MFA) for moderator accounts to reduce the impact of credential theft via XSS.