# CVE-2026-5338: Tenda G103 Setting system.lua action_set_system_settings command injection

> Remote attackers can execute arbitrary commands on Tenda G103 routers via the lanIp argument in the system settings handler.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Apr 2026
- **Updated:** 2 Apr 2026
- **Also known as:** GHSA-jwm4-jqjj-6v3x

## What is CVE-2026-5338?

CVE-2026-5338 is a medium-severity command injection vulnerability in Tenda G103, published on 2 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A security vulnerability has been detected in Tenda G103 1.0.0.5. The affected element is the function action_set_system_settings of the file system.lua of the component Setting Handler. Such manipulation of the argument lanIp leads to command injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.

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-2026-5338?

It affects 1 product.


Products: Tenda G103 Firmware.

## How do I fix CVE-2026-5338?

No fix has been published for CVE-2026-5338 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5338 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5338 exists.

## Other vulnerabilities in Tenda G103

- [CVE-2023-27076](https://insights.sbomify.com/CVE-2023-27076/): Command injection in n/a (critical 9.8)
- [CVE-2023-33530](https://insights.sbomify.com/CVE-2023-33530/): Command injection in n/a (high 8.8)
- [CVE-2023-27079](https://insights.sbomify.com/CVE-2023-27079/): Command injection in n/a (high 7.5)
- [CVE-2026-5339](https://insights.sbomify.com/CVE-2026-5339/): Tenda G103 Setting gpon.lua action_set_net_settings command injection (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5338 and fix it if it is affected.

What it is: CVE-2026-5338 is a medium-severity command injection vulnerability in Tenda G103, published on 2 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5338 exists.

Affected product: Tenda G103. 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-2026-5338/ (Markdown: https://insights.sbomify.com/CVE-2026-5338/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5338
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5338
- OSV: https://osv.dev/vulnerability/CVE-2026-5338

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5338/
Summaries are generated and may contain mistakes; the official description above is the record.