# CVE-2026-4840: Netcore Power 15AX Diagnostic Tool netis.cgi setTools os command injection

> Remote attackers can execute arbitrary OS commands via the Diagnostic Tool interface due to improper input validation in the setTools function.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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:** 26 Mar 2026
- **Updated:** 30 Mar 2026
- **Also known as:** GHSA-6m7m-cxf3-4phv

## What is CVE-2026-4840?

CVE-2026-4840 is a high-severity command injection vulnerability in Netcore Power 15AX, published on 26 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A security flaw has been discovered in Netcore Power 15AX up to 3.0.0.6938. Affected by this issue is the function setTools of the file /bin/netis.cgi of the component Diagnostic Tool Interface. Performing a manipulation of the argument IpAddr results in os command injection. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-4840?


## How do I fix CVE-2026-4840?

No fix has been published for CVE-2026-4840 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4840 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4840 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4840 and fix it if it is affected.

What it is: CVE-2026-4840 is a high-severity command injection vulnerability in Netcore Power 15AX, published on 26 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-2026-4840 exists.

Affected product: Netcore Power 15AX. 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-2026-4840/ (Markdown: https://insights.sbomify.com/CVE-2026-4840/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4840
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4840
- OSV: https://osv.dev/vulnerability/CVE-2026-4840

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4840/
Summaries are generated and may contain mistakes; the official description above is the record.