CVE-2026-20748 in api.everon.io
Summary
by MITRE • 03/06/2026
The WebSocket backend uses charging station identifiers to uniquely associate sessions but allows multiple endpoints to connect using the same session identifier. This implementation results in predictable session identifiers and enables session hijacking or shadowing, where the most recent connection displaces the legitimate charging station and receives backend commands intended for that station. This vulnerability may allow unauthorized users to authenticate as other users or enable a malicious actor to cause a denial-of-service condition by overwhelming the backend with valid session requests.
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Analysis
by VulDB Data Team • 05/06/2026
The vulnerability described in CVE-2026-20748 represents a critical security flaw in WebSocket backend implementations used for charging station management systems. This issue stems from the improper handling of session identifiers within the charging station communication framework, creating predictable and exploitable session management mechanisms that fundamentally compromise the security posture of the entire charging infrastructure. The vulnerability specifically affects systems where WebSocket connections serve as the primary communication channel between charging stations and backend management systems, commonly found in electric vehicle charging networks and smart grid implementations.
The technical flaw manifests in the backend's reliance on charging station identifiers as session tokens without proper validation or uniqueness enforcement mechanisms. When multiple endpoints attempt to establish connections using identical session identifiers, the system fails to detect or prevent these conflicts, allowing the most recent connection to overwrite legitimate session state. This predictable session identifier generation creates a scenario where attackers can easily guess or enumerate valid session tokens, as the identifiers follow discernible patterns based on charging station characteristics. The implementation violates fundamental security principles of session management and authentication, creating a pathway for unauthorized access and operational disruption. This vulnerability maps directly to CWE-305 Authentication Bypass Through User Identification, as it allows attackers to assume the identity of legitimate charging stations through session hijacking techniques.
The operational impact of this vulnerability extends beyond simple authentication bypass to encompass significant denial-of-service conditions and potential command injection scenarios. When a malicious actor establishes a connection with a valid session identifier, they can effectively displace the legitimate charging station from the backend system, causing the legitimate device to lose connectivity while the attacker receives all subsequent commands intended for the original station. This shadowing behavior can lead to complete operational disruption of charging services, where unauthorized parties gain control over charging station operations and can potentially manipulate charging sessions, billing data, or security configurations. The vulnerability also creates opportunities for cascading failures within charging networks, where multiple stations become compromised through a single successful attack. From an attack perspective, this issue aligns with ATT&CK technique T1566 Phishing for Information, as attackers can exploit predictable session identifiers to gain unauthorized access to charging infrastructure without requiring additional credentials or complex attack vectors.
Mitigation strategies for CVE-2026-20748 must address both the immediate session management flaws and implement comprehensive security controls to prevent future occurrences. Organizations should implement robust session identifier generation mechanisms that utilize cryptographically secure random number generators to ensure unpredictability of session tokens. The backend system must enforce strict session uniqueness validation, preventing multiple concurrent connections from using identical identifiers while implementing proper session lifecycle management. Additional controls should include session timeout mechanisms, connection tracking with proper authentication validation, and monitoring for unusual session activity patterns. Network-level protections such as rate limiting and connection validation can help detect and prevent abuse of the vulnerability. The implementation should also include logging and alerting mechanisms that trigger when duplicate session identifiers are detected, enabling rapid response to potential attacks. Security architects should consider implementing multi-factor authentication for charging station connections and establish secure communication channels using TLS protocols to prevent session token interception during transmission. Regular security assessments and penetration testing should be conducted to verify the effectiveness of implemented controls and identify potential additional vulnerabilities in the charging station communication infrastructure.