# CVE-2026-4543: Wavlink WL-WN578W2 POST Request firewall.cgi command injection

> Remote attackers can execute arbitrary commands on Wavlink WL-WN578W2 routers via a command injection vulnerability in the firewall.cgi POST handler.

- **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:** 22 Mar 2026
- **Updated:** 23 Mar 2026
- **Also known as:** GHSA-xvp7-mx9h-8g48

## What is CVE-2026-4543?

CVE-2026-4543 is a medium-severity command injection vulnerability in Wavlink WL-WN578W2, published on 22 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in Wavlink WL-WN578W2 221110. The impacted element is an unknown function of the file /cgi-bin/firewall.cgi of the component POST Request Handler. Performing a manipulation of the argument dmz_flag/del_flag results in command injection. It is possible to initiate the attack remotely. The exploit has been made public and could 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-2026-4543?

It affects 1 product.


Products: Wavlink Wl-Wn578w2 Firmware.

## How do I fix CVE-2026-4543?

No fix has been published for CVE-2026-4543 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4543 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4543 exists.

## Other vulnerabilities in Wavlink WL-WN578W2

- [CVE-2025-10358](https://insights.sbomify.com/CVE-2025-10358/): Wavlink WL-WN578W2 wireless.cgi sub_404850 os command injection (medium 6.9)
- [CVE-2025-10359](https://insights.sbomify.com/CVE-2025-10359/): Wavlink WL-WN578W2 wireless.cgi sub_404DBC os command injection (medium 6.9)
- [CVE-2025-10321](https://insights.sbomify.com/CVE-2025-10321/): Wavlink WL-WN578W2 live_online.shtml information disclosure (medium 6.9)
- [CVE-2025-10322](https://insights.sbomify.com/CVE-2025-10322/): Wavlink WL-WN578W2 sysinit.html password recovery (medium 6.9)
- [CVE-2025-10323](https://insights.sbomify.com/CVE-2025-10323/): Wavlink WL-WN578W2 wizard_rep.shtml sub_409184 command injection (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4543 and fix it if it is affected.

What it is: CVE-2026-4543 is a medium-severity command injection vulnerability in Wavlink WL-WN578W2, published on 22 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-2026-4543 exists.

Affected product: Wavlink WL-WN578W2. 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-2026-4543/ (Markdown: https://insights.sbomify.com/CVE-2026-4543/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4543
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4543
- OSV: https://osv.dev/vulnerability/CVE-2026-4543

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4543/
Summaries are generated and may contain mistakes; the official description above is the record.