# CVE-2026-31904

## Summary

- **CVE ID:** CVE-2026-31904
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-307
- **Published:** Mar 20, 2026
- **Last Modified:** Mar 23, 2026

## 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.

## Affected Products

- CTEK — Chargeportal (All versions)

## References

- [CNA](https://www.cisa.gov/news-events/ics-advisories/icsa-26-078-06)
- [CNA](https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-078-06.json)
- [CNA](https://www.ctek.com/support)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.0

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._