CVE-2026-20882 in e-mobi.hu
Summary
by MITRE • 03/06/2026
The WebSocket Application Programming Interface lacks restrictions on the number of authentication requests. This absence of rate limiting may allow an attacker to conduct denial-of-service attacks by suppressing or mis-routing legitimate charger telemetry, or conduct brute-force attacks to gain unauthorized access.
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Analysis
by VulDB Data Team • 03/12/2026
The vulnerability identified as CVE-2026-20882 resides within the WebSocket Application Programming Interface implementation where insufficient controls exist to manage the volume of authentication requests. This weakness creates a fundamental security gap that directly impacts the integrity and availability of connected systems. The absence of rate limiting mechanisms in the WebSocket interface allows malicious actors to exploit the protocol without proper constraints on authentication attempts, fundamentally undermining the security posture of any system relying on this communication method. Such a flaw represents a critical design oversight that enables attackers to manipulate the authentication flow in ways that can severely disrupt normal operations while simultaneously opening pathways for unauthorized access.
The technical flaw manifests as a lack of enforcement mechanisms to monitor and restrict the frequency of authentication requests within the WebSocket protocol implementation. This absence creates an environment where attackers can rapidly submit multiple authentication attempts without facing any form of throttling or blocking. The vulnerability operates at the application layer and specifically targets the authentication handling capabilities of WebSocket connections, making it particularly dangerous given that WebSocket protocols are commonly used for real-time communication and telemetry data transmission in critical infrastructure systems. The flaw aligns with CWE-307, which addresses improper restriction of repeated attempts, and represents a classic example of insufficient rate limiting in network protocols. From an operational perspective, this vulnerability enables attackers to consume system resources at an unsustainable rate while potentially bypassing legitimate authentication mechanisms through automated brute-force attempts.
The operational impact of this vulnerability extends beyond simple denial-of-service conditions to encompass significant security risks that can compromise entire systems. Attackers can leverage this weakness to suppress legitimate charger telemetry by overwhelming the authentication system, effectively disrupting critical operational data flows that may be essential for monitoring and control functions. This disruption can lead to cascading failures in systems where real-time telemetry is crucial for maintaining operational integrity. Additionally, the vulnerability enables brute-force attacks that can systematically attempt to guess valid authentication credentials, potentially leading to unauthorized system access and complete compromise of the affected infrastructure. The impact is particularly severe in industrial control systems, smart grid environments, and IoT deployments where WebSocket communications are prevalent for telemetry and control functions.
Mitigation strategies for CVE-2026-20882 must address both the immediate security concerns and implement comprehensive rate limiting mechanisms throughout the WebSocket authentication process. Organizations should implement robust authentication throttling that monitors and limits the number of authentication attempts per client connection within defined time intervals. The implementation should include adaptive rate limiting that can detect and respond to anomalous authentication patterns while maintaining legitimate user access. Security controls should also incorporate connection tracking mechanisms that can identify and temporarily block suspicious authentication activity. Network segmentation and monitoring solutions should be deployed to detect unusual authentication traffic patterns that may indicate exploitation attempts. From a compliance perspective, this vulnerability addresses requirements outlined in various security frameworks including the NIST Cybersecurity Framework and ISO/IEC 27001 standards, which emphasize the importance of implementing proper access controls and rate limiting to prevent unauthorized access and maintain system availability. Organizations should also consider implementing multi-factor authentication mechanisms to add additional layers of security beyond simple credential validation.