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

Medium 6.6 Published 24 Feb 2026 Updated 24 Feb 2026

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

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: None listed

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

Which versions are affected by CVE-2026-25603?

It affects 2 products.

Products include 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.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-25603 being exploited?

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

Sources

Also known as GHSA-6xhx-53c5-f9qr.