# CVE-2026-4228: LB-LINK BL-WR9000 set_wifi sub_458754 command injection

> Remote attackers can execute arbitrary commands on LB-LINK BL-WR9000 routers via the set_wifi interface, posing a critical security risk.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Mar 2026
- **Updated:** 16 Mar 2026
- **Also known as:** GHSA-hxpm-2ppg-5m8m

## What is CVE-2026-4228?

CVE-2026-4228 is a medium-severity command injection vulnerability in LB-LINK BL-WR9000, published on 16 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was detected in LB-LINK BL-WR9000 2.4.9. This affects the function sub_458754 of the file /goform/set_wifi. The manipulation results in command injection. It is possible to launch the attack remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-4228?

It affects 1 product.


Products: Lb-Link Bl-Wr9000 Firmware.

## How do I fix CVE-2026-4228?

No fix has been published for CVE-2026-4228 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4228 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4228 exists.

## Other vulnerabilities in LB-LINK BL-WR9000

- [CVE-2026-4226](https://insights.sbomify.com/CVE-2026-4226/): LB-LINK BL-WR9000 get_virtual_cfg sub_44E8D0 stack-based overflow (high 8.7)
- [CVE-2026-4227](https://insights.sbomify.com/CVE-2026-4227/): LB-LINK BL-WR9000 get_hidessid_cfg sub_44D844 buffer overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4228 and fix it if it is affected.

What it is: CVE-2026-4228 is a medium-severity command injection vulnerability in LB-LINK BL-WR9000, published on 16 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4228 exists.

Affected product: LB-LINK BL-WR9000. 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-2026-4228/ (Markdown: https://insights.sbomify.com/CVE-2026-4228/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4228
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4228
- OSV: https://osv.dev/vulnerability/CVE-2026-4228

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4228/
Summaries are generated and may contain mistakes; the official description above is the record.