CVE-2026-20792 identifies a security weakness in Chargemap's WebSocket API, specifically related to the absence of rate limiting on authentication requests. This vulnerability is categorized under CWE-307, which concerns improper restriction of excessive authentication attempts. The WebSocket API allows continuous bi-directional communication between clients and servers, commonly used for real-time telemetry data exchange in EV charging stations managed via Chargemap. Without rate limiting, an attacker can flood the authentication endpoint with numerous requests, leading to denial-of-service (DoS) conditions by overwhelming the system or causing legitimate charger telemetry data to be suppressed or misrouted. Additionally, the lack of restrictions facilitates brute-force attacks against authentication mechanisms, potentially allowing unauthorized access to the system. The CVSS 3.1 base score of 7.5 reflects a high severity, with an attack vector over the network (AV:N), no required privileges (PR:N), no user interaction (UI:N), and an impact primarily on availability (A:H) without affecting confidentiality or integrity. The vulnerability affects all versions of Chargemap's product, indicating a systemic issue in the authentication design. Although no public exploits have been reported, the vulnerability poses a significant risk to the availability and reliability of EV charging infrastructure telemetry and control systems.

The primary impact of CVE-2026-20792 is on the availability of Chargemap's EV charging telemetry and authentication services. Successful exploitation can lead to denial-of-service conditions, disrupting the real-time monitoring and management of charging stations. This disruption can affect EV users by causing charging delays or failures, undermining trust in the infrastructure. Additionally, brute-force attacks enabled by the lack of rate limiting may lead to unauthorized access, potentially allowing attackers to manipulate charger settings or gather sensitive operational data. For organizations operating EV charging networks, this could result in operational downtime, financial losses, reputational damage, and potential safety risks if charging stations are misconfigured or disabled. Given the increasing reliance on EV infrastructure globally, widespread exploitation could have cascading effects on transportation and energy sectors. The vulnerability's network-based attack vector and lack of required privileges make it accessible to remote attackers, increasing the threat surface.

To mitigate CVE-2026-20792, Chargemap and affected organizations should implement strict rate limiting on all authentication requests over the WebSocket API to prevent excessive attempts from a single source. Employing account lockout policies or progressive delays after failed authentication attempts can further reduce brute-force risks. Monitoring and alerting on abnormal authentication request patterns will help detect ongoing attacks early. Additionally, integrating multi-factor authentication (MFA) can strengthen access controls. Network-level protections such as Web Application Firewalls (WAFs) configured to detect and block suspicious traffic patterns targeting the authentication endpoint are recommended. Regular security audits and penetration testing focused on authentication mechanisms should be conducted to identify and remediate similar issues. Finally, Chargemap should prioritize releasing patches or updates addressing this vulnerability and communicate mitigation guidance clearly to all users and partners.