# CVE-2026-9397: Besen BS20 EV Charging Station OTA Update Installation improper authorization

> Remote attackers can bypass authorization in the OTA update handler to install malicious firmware on Besen BS20 EV charging stations.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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-2468-xgpc-jvv7

## What is CVE-2026-9397?

CVE-2026-9397 is a critical missing authorization 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 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."

Weakness: CWE-285 (Improper Authorization), CWE-266 (Incorrect Privilege Assignment)

## Which versions are affected by CVE-2026-9397?


## How do I fix CVE-2026-9397?

No fix has been published for CVE-2026-9397 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9397 being exploited?

There is no known exploitation of CVE-2026-9397 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9397 and fix it if it is affected.

What it is: CVE-2026-9397 is a critical missing authorization 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: There is no known exploitation of CVE-2026-9397 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-2026-9397/ (Markdown: https://insights.sbomify.com/CVE-2026-9397/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9397
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9397
- OSV: https://osv.dev/vulnerability/CVE-2026-9397

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9397/
Summaries are generated and may contain mistakes; the official description above is the record.