Auth bypass in Besen Bs20 Ev Charging Station
CVE-2026-9398
A security vulnerability has been detected in Besen BS20 EV Charging Station up to 20260426. This affects an unknown part of the component BLE/WiFi. Such manipulation leads to authentication bypass by capture-replay. The attack must be carried out from within the local network. Attacks of this nature are highly complex. It is indicated that the exploitability is difficult. The original disclosure mentions, that "[t]hese vulnerabilities have been reported to Besen and we have received their acknowlegement that they are reviewing this as of April 2026."
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Besen Bs20 Ev Charging Station — versions 20260426
Weakness classification (CWE)
References
- vuldb.com/vuln/365379 (vdb-entry)
- vuldb.com/vuln/365379/cti (signature, permissions-required)
- vuldb.com/submit/813577 (third-party-advisory)
- github.com/carfeii/besen (related)
Frequently asked questions
- What is CVE-2026-9398?
- CVE-2026-9398 is a low-severity vulnerability in Besen Bs20 Ev Charging Station, classified under Improper Authentication. CVSS score: 3.1/10. Published 2026-05-24.
- How severe is CVE-2026-9398?
- Low severity. CVSS v3 base score is 3.1 out of 10.