CVE-2026-27764
Published: 06 March 2026
Summary
CVE-2026-27764 is a medium-severity Insufficient Session Expiration (CWE-613) vulnerability in Mvm Mobiliti E-Mobi.Hu. Its CVSS base score is 6.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Valid Accounts (T1078); ranked at the 21.0th 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-2026-27764 is a vulnerability in the WebSocket backend of a charging station management system, where session association relies on charging station identifiers but permits multiple endpoints to connect using the same session identifier. This design flaw produces predictable session identifiers, facilitating session hijacking or shadowing. In such attacks, the most recent connection overrides the legitimate charging station, intercepting backend commands intended for it. The issue is classified under CWE-613 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).
The vulnerability is exploitable over the network by unauthenticated attackers with low complexity. An adversary can connect using a known or predictable session identifier to displace a legitimate charging station, enabling unauthorized authentication as other users or interception of sensitive commands. Alternatively, a malicious actor can overwhelm the backend with valid session requests, triggering a denial-of-service condition.
Advisories provide guidance on mitigation, including details in CISA ICSA-26-062-06 at https://www.cisa.gov/news-events/ics-advisories/icsa-26-062-06, the corresponding CSAF JSON file at https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-062-06.json, and vendor support resources at https://mobiliti.hu/emobilitas/ugyfeltamogatas/ugyfelszolgalat.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10040
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?
The CVE describes a predictable session identifier flaw in a public-facing WebSocket service that directly enables session hijacking/shadowing for unauthorized authentication (T1078 Valid Accounts) and remote service session hijacking (T1563). Exploitation occurs over the network against an exposed management system without authentication, mapping to T1190 Exploit Public-Facing Application. The DoS aspect is secondary and less directly tied to a single technique.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires protection of session authenticity, preventing hijacking via predictable or reusable WebSocket session identifiers.
Limits concurrent sessions per identifier, blocking the multiple-endpoint shadowing that displaces legitimate charging stations.
Mandates management of identifiers to ensure uniqueness and non-predictability, eliminating the root cause of session hijacking in this implementation.