CVE-2026-26305

High

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 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Score 0.0010 28.0th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-26305 is a high-severity Improper Restriction of Excessive Authentication Attempts (CWE-307) vulnerability in Mobility46 Mobility46.Se. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Brute Force (T1110); ranked at the 28.0th 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-7 (Unsuccessful Logon Attempts) and SC-5 (Denial-of-service Protection).

Threat & Defense at a Glance

What attackers do: exploitation maps to Brute Force (T1110) and 2 other techniques. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

AC-7 Unsuccessful Logon Attempts good match

prevent

Directly enforces limits on consecutive invalid authentication attempts, preventing brute-force attacks and DoS from excessive WebSocket authentication requests.

SC-5 Denial-of-service Protection good match

prevent

Provides denial-of-service protection mechanisms to limit the effects of excessive authentication requests that suppress or mis-route legitimate charger telemetry.

SC-6 Resource Availability partial match

prevent

Ensures resource availability by prioritizing and managing allocations, mitigating resource exhaustion from floods of authentication requests.

MITRE ATT&CK Enterprise TechniquesAI

T1110 Brute Force Credential Access

Adversaries may use brute force techniques to gain access to accounts when passwords are unknown or when password hashes are obtained.

attack.mitre.org →

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1499 Endpoint Denial of Service Impact

Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.

attack.mitre.org →

Why these techniques?

Lack of rate limiting on public-facing WebSocket auth API directly enables brute force credential attacks (T1110) and application-layer DoS via request flooding (T1499); exploitation occurs remotely against exposed service (T1190).

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

NVD Description

The WebSocket Application Programming Interface lacks restrictions on the number of authentication requests. This absence of rate limiting may allow an attacker to conduct denial-of-service attacks by suppressing or mis-routing legitimate charger telemetry, or conduct brute-force attacks to gain unauthorized…

access.

Deeper analysisAI

CVE-2026-26305 is a vulnerability in the WebSocket Application Programming Interface that lacks restrictions on the number of authentication requests due to the absence of rate limiting. This issue, tied to CWE-307 (Improper Restriction of Excessive Authentication Attempts), carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and was published on 2026-02-27T01:16:20.617. It affects systems handling charger telemetry, as detailed in the associated CISA ICS advisory.

A remote attacker requires no privileges or user interaction and can exploit this over the network with low complexity. Successful exploitation enables denial-of-service attacks by suppressing or mis-routing legitimate charger telemetry, or brute-force attacks to achieve unauthorized access.

CISA advisory ICSA-26-057-08 provides details on the vulnerability, available at https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-08 and the corresponding CSAF JSON at https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-08.json. Vendor contact information is at https://www.mobility46.se/en/contact-us.