# CVE-2026-9398: Besen BS20 EV Charging Station BLE/WiFi authentication replay

> Attackers on the local network can bypass authentication on Besen BS20 EV charging stations via BLE/WiFi replay attacks.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 May 2026
- **Updated:** 29 May 2026
- **Also known as:** GHSA-vvwr-2pc3-326q

## What is CVE-2026-9398?

CVE-2026-9398 is a low-severity authentication bypass vulnerability in Besen BS20 EV Charging Station, published on 24 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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."

Weakness: CWE-294 (Authentication Bypass by Capture-replay), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-9398?


## How do I fix CVE-2026-9398?

No fix has been published for CVE-2026-9398 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9398 being exploited?

There is no known exploitation of CVE-2026-9398 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9398 and fix it if it is affected.

What it is: CVE-2026-9398 is a low-severity authentication bypass vulnerability in Besen BS20 EV Charging Station, published on 24 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-9398 in the wild and no public exploit code.

Affected product: Besen BS20 EV Charging Station. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-9398/ (Markdown: https://insights.sbomify.com/CVE-2026-9398/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9398
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9398
- OSV: https://osv.dev/vulnerability/CVE-2026-9398

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-9398/
Summaries are generated and may contain mistakes; the official description above is the record.