CVE-2026-27647
Published: 27 February 2026
Summary
CVE-2026-27647 is a medium-severity Insufficient Session Expiration (CWE-613) vulnerability in Mobility46 Mobility46.Se. 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 21.9th 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-2026-27647 is a vulnerability in the WebSocket backend of a charging station management system, where session association relies on charging station identifiers. The implementation permits multiple endpoints to connect using the same session identifier, resulting in predictable session IDs. This flaw enables session hijacking or shadowing, as the most recent connection displaces the legitimate charging station and intercepts backend commands intended for it. The issue is rated with 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 maps to CWE-613 (Insufficient Session Expiration).
Remote attackers require no privileges or user interaction to exploit this vulnerability over the network with low complexity. An unauthorized user can hijack a session to authenticate as another user or legitimate charging station, potentially gaining limited access to commands or data. Alternatively, a malicious actor can shadow sessions or overwhelm the backend with valid session requests, leading to a denial-of-service condition that disrupts operations for affected charging stations.
Advisories published around the vulnerability disclosure on 2026-02-27 detail mitigation strategies, as outlined in CISA ICSA-26-057-08 (https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-08) and the corresponding CSAF JSON file (https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-08.json). Vendor contact information is available at https://www.mobility46.se/en/contact-us for further guidance on patches or workarounds.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-8964
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 service directly enables remote exploitation (T1190); insufficient session expiration and reusable identifiers facilitate remote service session hijacking/takeover of charging station or user sessions (T1563) and use of hijacked web/session tokens for alternate authentication (T1550.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents multiple endpoints from simultaneously using the same charging-station session identifier, blocking the hijacking/shadowing described in the CVE.
Requires cryptographic or protocol-level protection of session authenticity so that a new connection cannot silently displace a legitimate WebSocket session.
Mandates non-predictable, unique session identifiers, eliminating the predictable charging-station-ID-based sessions that enable the attack.