# CVE-2026-25603: Path Traversal vulnerability in Linksys MR9600, Linksys MX4200

> Attackers can mount USB partitions to arbitrary locations to execute shell scripts as root on Linksys routers.

- **Severity:** Medium 6.6 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 24 Feb 2026
- **Updated:** 24 Feb 2026
- **Also known as:** GHSA-6xhx-53c5-f9qr

## What is CVE-2026-25603?

CVE-2026-25603 is a medium-severity path traversal vulnerability in Linksys MR9600, published on 24 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Linksys MR9600, Linksys MX4200 allows that contents of a USB drive partition can be mounted in an arbitrary location of the file system. This may result in the execution of shell scripts in the context of a root user.This issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-25603?

It affects 2 products.


Products: Linksys Mr9600 Firmware, Linksys Mx4200 Firmware.

## How do I fix CVE-2026-25603?

No fix has been published for CVE-2026-25603 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-25603 being exploited?

There is no known exploitation of CVE-2026-25603 in the wild and no public exploit code.

## Other vulnerabilities in Linksys MR9600

- [CVE-2026-4558](https://insights.sbomify.com/CVE-2026-4558/): Linksys MR9600 SmartConnect.lua smartConnectConfigure os command injection (high 8.7)
- [CVE-2026-6992](https://insights.sbomify.com/CVE-2026-6992/): Linksys MR9600 JNAP Action run_central2.sh BTRequestGetSmartConnectStatus os command injection (high 8.6)
- [CVE-2022-24372](https://insights.sbomify.com/CVE-2022-24372/): Path traversal in n/a (medium 4.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-25603 and fix it if it is affected.

What it is: CVE-2026-25603 is a medium-severity path traversal vulnerability in Linksys MR9600, published on 24 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-25603 in the wild and no public exploit code.

Affected product: Linksys MR9600. 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-2026-25603/ (Markdown: https://insights.sbomify.com/CVE-2026-25603/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-25603
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-25603
- OSV: https://osv.dev/vulnerability/CVE-2026-25603

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-25603/
Summaries are generated and may contain mistakes; the official description above is the record.