CVE-2025-55620 is a cross-site scripting (XSS) vulnerability identified in the valuateJavascript() function of Reolink firmware version 4.54.0.4.20250526. Reolink is a manufacturer of IP cameras and surveillance devices widely used for security monitoring. The vulnerability arises because the valuateJavascript() function improperly handles user-supplied input, allowing an attacker to inject and execute arbitrary JavaScript or HTML code within the context of the device's web interface. This type of vulnerability typically occurs when input is not properly sanitized or escaped before being processed or rendered in a web page. Exploiting this vulnerability could enable an attacker to perform actions such as stealing session cookies, redirecting users to malicious sites, or executing unauthorized commands through the web interface. Although no known exploits are currently reported in the wild, the vulnerability is publicly disclosed and could be targeted by attackers once exploit code becomes available. The lack of a CVSS score and absence of patch information indicate that this vulnerability is newly disclosed and may not yet have an official fix. The vulnerability affects a specific firmware version, but no other versions are listed, so it is unclear if earlier or later versions are impacted. The vulnerability is classified as a client-side attack vector but could have significant consequences if the device is used in sensitive environments or integrated into larger security systems.

For European organizations, the impact of this XSS vulnerability in Reolink devices can be significant, especially for entities relying on these cameras for physical security and surveillance. Successful exploitation could allow attackers to hijack administrative sessions, manipulate camera settings, or pivot into internal networks if the cameras are connected to corporate infrastructure. This could lead to unauthorized surveillance, data leakage, or disruption of security monitoring capabilities. Organizations in sectors such as critical infrastructure, government, finance, and healthcare that deploy Reolink cameras could face increased risk of espionage or sabotage. Additionally, compromised devices could be used as entry points for broader network attacks or as part of botnets. The vulnerability's exploitation does not require authentication, increasing the attack surface, especially if the device's web interface is exposed to untrusted networks or the internet. Given the growing adoption of IoT and smart surveillance in Europe, the vulnerability poses a tangible risk to confidentiality, integrity, and availability of security monitoring systems.

To mitigate this vulnerability, European organizations should immediately assess their deployment of Reolink devices and identify those running the affected firmware version 4.54.0.4.20250526. Until an official patch is released, organizations should restrict access to the camera web interfaces by implementing network segmentation and firewall rules that limit access to trusted management networks only. Disabling remote web access or VPN access to these devices can reduce exposure. Employing web application firewalls (WAFs) that can detect and block XSS payloads targeting the device interfaces may provide additional protection. Organizations should also monitor network traffic and device logs for suspicious activity indicative of exploitation attempts. It is advisable to contact Reolink support for updates on patches or firmware upgrades addressing this vulnerability and plan timely deployment once available. Additionally, educating administrators on secure configuration practices and the risks of exposing device management interfaces to the internet is critical. Finally, consider alternative devices with stronger security postures if timely remediation is not feasible.