CVE-2026-27652 in CloudCharge
Summary
by MITRE • 02/27/2026
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 • 03/06/2026
The vulnerability described in CVE-2026-27652 represents a critical weakness in WebSocket session management within charging station backend systems that directly impacts both authentication integrity and system availability. This flaw stems from the backend's reliance on charging station identifiers as session tokens, creating a predictable session identifier generation mechanism that fundamentally undermines the security model of the charging infrastructure. The implementation allows multiple endpoints to establish connections using identical session identifiers, which creates a scenario where session hijacking becomes trivially achievable through simple connection replacement techniques.
The technical flaw manifests as a predictable session identifier generation system where the same charging station identifier can be reused across multiple connections, violating fundamental security principles of session uniqueness and authentication. This design flaw creates a race condition where the most recent connection automatically displaces the previous legitimate connection, effectively enabling shadowing attacks where unauthorized endpoints can seamlessly take over active charging sessions. The vulnerability directly maps to CWE-305 authentication weakness and CWE-307 improper session handling, both of which specifically address issues related to session predictability and unauthorized access through session manipulation.
From an operational impact perspective, this vulnerability creates multiple attack vectors that can severely compromise charging station infrastructure security. The session hijacking capability allows malicious actors to authenticate as legitimate charging stations, potentially gaining unauthorized access to backend systems and control over charging operations. The shadowing mechanism enables denial-of-service conditions where attackers can overwhelm the backend with valid session requests, causing legitimate charging stations to be continuously displaced and unable to perform their intended functions. This scenario particularly affects critical infrastructure where charging station availability directly impacts user experience and business operations.
The vulnerability enables a range of malicious activities including unauthorized charging station impersonation, command interception, and system disruption that can result in financial loss and service degradation. Attackers can exploit the predictable session identifiers to establish connections that appear legitimate to the backend system, bypassing normal authentication mechanisms and gaining unauthorized control over charging operations. The implementation also creates a persistent threat where legitimate charging stations may be repeatedly displaced by malicious connections, leading to extended service outages and potential safety concerns in charging environments.
Mitigation strategies should focus on implementing robust session management mechanisms that ensure unique session identifiers for each connection, including random session token generation and proper session lifecycle management. The backend system should enforce strict session validation and implement connection tracking to prevent multiple simultaneous connections from using identical identifiers. Network-level controls should monitor for suspicious connection patterns and implement rate limiting to prevent session flooding attacks. Additionally, the system should implement proper session invalidation mechanisms to ensure that when connections are displaced, the original session is properly terminated and cannot be reused by unauthorized parties. These measures align with ATT&CK technique T1566 for credential access and T1499 for endpoint denial of service, addressing both authentication bypass and availability compromise aspects of this vulnerability.