CVE-2026-9398
CVE-2026-9398 is a low-severity vulnerability with a CVSS 3.x base score of 3.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.
Key facts
- Severity: Low (CVSS 3.x base score 3.1)
- CVSS v2: 1.8
- CVSS v4: 1.3
- EPSS exploit prediction: 0% (21st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-31550
- Weakness: CWE-287
- Published:
- Last modified:
Description
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."
Frequently asked questions
- What is 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."
- How severe is CVE-2026-9398?
- CVE-2026-9398 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
- Is CVE-2026-9398 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-9398?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-9398 have an EU (EUVD) identifier?
- Yes. CVE-2026-9398 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31550.
- When was CVE-2026-9398 published?
- CVE-2026-9398 was published on 2026-05-24 and last updated on 2026-06-17.
References
- https://github.com/carfeii/besen#finding-5-unauthorized-tampering-of-charger-commands
- https://vuldb.com/submit/813577
- https://vuldb.com/vuln/365379
- https://vuldb.com/vuln/365379/cti
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