CVE-2026-20748
Published: 06 March 2026
Summary
CVE-2026-20748 is a medium-severity Insufficient Session Expiration (CWE-613) vulnerability in Everon Api.Everon.Io. 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 16.3th 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-2026-20748, published on 2026-03-06, affects the WebSocket backend in a charging station management system. The vulnerability arises because the backend uses charging station identifiers to associate sessions but permits multiple endpoints to connect using the same session identifier. This design results in predictable session identifiers, facilitating session hijacking or shadowing, where the latest connection displaces the legitimate charging station and intercepts backend commands intended for it. Rated at CVSS 7.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) and mapped to CWE-613, it exposes low confidentiality, integrity, and availability impacts.
The attack requires only network access with low complexity and no privileges or user interaction. Remote attackers can exploit predictable session identifiers to connect as a legitimate charging station, enabling unauthorized authentication as other users by receiving and potentially acting on backend commands. Alternatively, a malicious actor can generate a denial-of-service condition by overwhelming the backend with valid session requests, displacing legitimate connections.
CISA has published ICS Advisory ICSA-26-062-08 addressing this vulnerability, with details available at https://www.cisa.gov/news-events/ics-advisories/icsa-26-062-08 and the corresponding CSAF JSON file at https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-062-08.json.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10031
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?
Vulnerability in public-facing WebSocket backend directly enables remote exploitation (T1190) via predictable session IDs, facilitating session hijacking of remote services (T1563).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents multiple endpoints from concurrently using the same charging-station session identifier, blocking the hijacking/shadowing displacement described in the CVE.
Enforces session authenticity protections that would invalidate or reject connections using predictable or duplicated session identifiers, stopping unauthorized interception of backend commands.
Requires proper management of session identifiers to ensure uniqueness and non-predictability, directly addressing the root cause that enables session hijacking in this WebSocket backend.