CVE-2026-20895

Medium

Published: 27 February 2026

Published

27 February 2026

Modified

05 March 2026

KEV Added

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Patch

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CVSS Score v4 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0005 16.6th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-20895 is a medium-severity Insufficient Session Expiration (CWE-613) vulnerability in Ev2Go Ev2Go.Io. Its CVSS base score is 6.9 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Remote Service Session Hijacking (T1563); ranked at the 16.6th 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-2026-20895 affects the WebSocket backend in charging station management systems, where charging station identifiers are used to uniquely associate sessions. However, the implementation permits multiple endpoints to connect using the same session identifier, resulting in predictable session identifiers. This flaw enables session hijacking or shadowing, in which the most recent connection displaces the legitimate charging station and intercepts backend commands intended for it. The vulnerability is associated with EV2Go (ev2go.io) and documented in CISA ICS Advisory ICSA-26-057-04, 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 mapped to CWE-613 (Insufficient Session Expiration).

The vulnerability is exploitable over the network by unauthenticated attackers with low complexity requirements. An attacker can predict session identifiers to connect as a legitimate charging station, enabling unauthorized authentication as other users or interception of commands. Alternatively, a malicious actor can overwhelm the backend with valid session requests, causing a denial-of-service condition by displacing legitimate sessions.

CISA ICS Advisory ICSA-26-057-04, available at https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-04, along with the corresponding CSAF file at https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-04.json, provides details on mitigation strategies for this operational technology vulnerability.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-8932

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…

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): CWE-613

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1563 Remote Service Session Hijacking Lateral Movement

Adversaries may take control of preexisting sessions with remote services to move laterally in an environment.

attack.mitre.org →

T1078 Valid Accounts Stealth

Adversaries may obtain and abuse credentials of existing accounts as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion.

attack.mitre.org →

Why these techniques?

Vulnerability enables session hijacking via predictable/reusable identifiers (T1563 Remote Service Session Hijacking) and impersonation using valid session material (T1078 Valid Accounts).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1