# CVE-2026-9396: Besen BS20 EV Charging Station Firmware Version Check ui layer

> Remote attackers can bypass UI layer restrictions in Besen BS20 EV charging stations, potentially exposing hidden interfaces or controls.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 May 2026
- **Updated:** 26 May 2026
- **Also known as:** GHSA-8j4m-2qxx-4mqg

## What is CVE-2026-9396?

CVE-2026-9396 is a medium-severity vulnerability in Besen BS20 EV Charging Station, published on 24 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A security flaw has been discovered in Besen BS20 EV Charging Station up to 20260426. Affected by this vulnerability is an unknown functionality of the component Firmware Version Check. The manipulation results in improper restriction of rendered ui layers. The attack can be executed remotely. A high complexity level is associated with this attack. The exploitation appears 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."

Weakness: CWE-1021 (Improper Restriction of Rendered UI Layers or Frames)

## Which versions are affected by CVE-2026-9396?


## How do I fix CVE-2026-9396?

No fix has been published for CVE-2026-9396 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9396 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9396 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9396 and fix it if it is affected.

What it is: CVE-2026-9396 is a medium-severity vulnerability in Besen BS20 EV Charging Station, published on 24 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9396 exists.

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-2026-9396/ (Markdown: https://insights.sbomify.com/CVE-2026-9396/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9396
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9396
- OSV: https://osv.dev/vulnerability/CVE-2026-9396

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9396/
Summaries are generated and may contain mistakes; the official description above is the record.