CVE-2026-26290
Published: 27 February 2026
Summary
CVE-2026-26290 is a medium-severity Insufficient Session Expiration (CWE-613) vulnerability in Ev.Energy Ev.Energy. Its CVSS base score is 6.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 25.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-10 (Concurrent Session Control) and SC-23 (Session Authenticity).
Deeper analysis
CVE-2026-26290 affects the WebSocket backend in ev.energy's charging station management system, where charging station identifiers are used to associate sessions but permit multiple endpoints to connect using the same identifier. This design flaw produces predictable session identifiers, facilitating session hijacking or shadowing. In this scenario, the most recent connection overrides the legitimate charging station, intercepting backend commands intended for it. The vulnerability carries a CVSS v3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) and is associated with CWE-613 (Insufficient Session Expiration).
Network-accessible attackers require no privileges or user interaction to exploit this issue. By leveraging predictable session identifiers, unauthorized parties can hijack active sessions, authenticate as legitimate charging stations or other users, and receive sensitive backend commands. Alternatively, malicious actors can induce a denial-of-service condition by flooding the backend with valid session requests, displacing legitimate connections and overwhelming system resources.
CISA's ICS Advisory ICSA-26-057-07 provides detailed guidance on mitigation, available at https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-07 and in CSAF JSON format at https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-07.json. Additional vendor information is at https://www.ev.energy/en-us.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-8961
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Public-facing WebSocket session management flaw (predictable/reusable IDs, insufficient expiration) directly enables unauthenticated exploitation of the application (T1190) and remote service session hijacking to impersonate stations/users or intercept commands (T1563).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents multiple WebSocket endpoints from concurrently using the same charging-station session identifier, blocking the hijacking/shadowing described in the CVE.
Requires cryptographic or protocol-level protection of session authenticity, eliminating the predictable-identifier weakness that allows an attacker to impersonate a legitimate charging station.
Enforces timely session termination and re-authentication, mitigating the insufficient session expiration (CWE-613) that enables persistent hijacking or DoS via repeated valid session requests.