# CVE-2026-90704: D-Link DWR-M921 formDiskPartition system command injection

> Remote attackers can execute arbitrary commands on D-Link DWR-M921 routers via the formDiskPartition interface due to improper input validation.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/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:** 14 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-qrw7-pm2g-vw5p

## What is CVE-2026-90704?

CVE-2026-90704 is a medium-severity command injection vulnerability in D-Link DWR-M921, published on 14 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability was found in D-Link DWR-M921 1.1.52. The impacted element is the function system of the file /boafrm/formDiskPartition. Performing a manipulation of the argument devicename results in command injection. Remote exploitation of the attack is possible. The exploit has been made public and could 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-2026-90704?


## How do I fix CVE-2026-90704?

No fix has been published for CVE-2026-90704 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-90704 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90704 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90704 and fix it if it is affected.

What it is: CVE-2026-90704 is a medium-severity command injection vulnerability in D-Link DWR-M921, published on 14 Sep 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-2026-90704 exists.

Affected product: D-Link DWR-M921. 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-2026-90704/ (Markdown: https://insights.sbomify.com/CVE-2026-90704/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90704
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90704
- OSV: https://osv.dev/vulnerability/CVE-2026-90704

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-90704/
Summaries are generated and may contain mistakes; the official description above is the record.