Auth bypass in Besen Bs20 Ev Charging Station
CVE-2026-9397
A weakness has been identified in Besen BS20 EV Charging Station up to 20260426. Affected by this issue is some unknown functionality of the component OTA Update Installation Handler. This manipulation causes improper authorization. The attack is possible to be carried out remotely. A high degree of complexity is needed for the attack. The exploitation is known to be 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."
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (53.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003
Affected products
- Besen Bs20 Ev Charging Station — versions 20260426
Weakness classification (CWE)
References
- vuldb.com/vuln/365378 (vdb-entry)
- vuldb.com/vuln/365378/cti (signature, permissions-required)
- vuldb.com/submit/813576 (third-party-advisory)
- github.com/carfeii/besen (patch)
Frequently asked questions
- What is CVE-2026-9397?
- CVE-2026-9397 is a high-severity vulnerability in Besen Bs20 Ev Charging Station, classified under Incorrect Privilege Assignment. CVSS score: 8.1/10. Published 2026-05-24.
- How severe is CVE-2026-9397?
- High severity. CVSS v3 base score is 8.1 out of 10.