CVE-2025-63211 is a stored cross-site scripting (XSS) vulnerability identified in bridgetech VBC Server & Element Manager firmware versions 6.5.0-9 through 6.5.0-10. The vulnerability resides in the handling of the addName parameter submitted to the /vbc/core/userSetupDoc/userSetupDoc endpoint. Because the input is not properly sanitized or encoded before being stored and later rendered in the web interface, an attacker can inject malicious JavaScript code that executes in the context of users accessing the affected interface. This stored XSS can lead to arbitrary code execution within the victim’s browser session, potentially allowing attackers to steal session tokens, perform actions on behalf of the user, or pivot further into the network. The vulnerability requires no authentication (PR:N) but does require user interaction (UI:R), such as an administrator or user visiting a maliciously crafted page or interface. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, indicating network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, with low confidentiality and integrity impacts and no availability impact. No public exploits or patches have been reported as of the publication date (November 19, 2025). The vulnerability is classified under CWE-79, a common weakness for cross-site scripting issues. Given the nature of the product—bridgetech VBC Server & Element Manager, which is often used in broadcast and industrial control environments—this vulnerability could be leveraged to compromise administrative sessions or disrupt operational integrity if exploited.

For European organizations, the impact of CVE-2025-63211 can be significant, especially for those operating in broadcast media, industrial automation, or critical infrastructure sectors where bridgetech VBC Server & Element Manager products are deployed. Exploitation could lead to unauthorized access to administrative interfaces, session hijacking, or manipulation of system configurations through the victim’s browser. This compromises confidentiality and integrity of sensitive operational data and control commands. While availability is not directly affected, the indirect consequences of compromised administrative control could lead to operational disruptions. The vulnerability’s requirement for user interaction limits mass exploitation but targeted spear-phishing or social engineering attacks could be effective. European organizations with remote management interfaces exposed to the internet or insufficient network segmentation are at higher risk. Additionally, the lack of available patches increases the window of exposure until mitigations or updates are applied.

1. Implement strict input validation and output encoding on the addName parameter at the application level to prevent malicious script injection. 2. Restrict access to the /vbc/core/userSetupDoc/userSetupDoc endpoint via network segmentation and firewall rules, limiting it to trusted internal networks only. 3. Employ web application firewalls (WAFs) with custom rules to detect and block XSS payloads targeting this endpoint. 4. Educate users and administrators about the risks of clicking on untrusted links or opening suspicious content to reduce the likelihood of user interaction exploitation. 5. Monitor logs and network traffic for unusual activity related to the vulnerable endpoint. 6. Coordinate with bridgetech for firmware updates or patches and apply them promptly once available. 7. Consider deploying Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the web interface. 8. Conduct regular security assessments and penetration testing focused on web interface vulnerabilities to identify and remediate similar issues proactively.