CVE-2026-27764
Analyzed Analyzed - Analysis Complete
Session Hijacking in WebSocket Backend via Predictable IDs

Publication date: 2026-03-06

Last updated on: 2026-05-05

Assigner: ICS-CERT

Description
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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Meta Information
Published
2026-03-06
Last Modified
2026-05-05
Generated
2026-06-16
AI Q&A
2026-03-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-27764
EUVD
EUVD-2026-10040
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mvm mobiliti_e-mobi.hu *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-613 According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization."
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Executive Summary

This vulnerability occurs because the WebSocket backend uses charging station identifiers to uniquely associate sessions but allows multiple endpoints to connect using the same session identifier.

As a result, session identifiers become predictable, enabling session hijacking or shadowing. In this scenario, the most recent connection can displace the legitimate charging station and receive backend commands intended for that station.

Impact Analysis

This vulnerability may allow unauthorized users to authenticate as other users, potentially gaining access to their sessions.

Additionally, a malicious actor could cause a denial-of-service condition by overwhelming the backend with valid session requests.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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