CVE-2026-27846 Missing authentication in Linksys MR9600, Linksys MX4200
Physical access allows adding mesh devices to extract admin and Wi-Fi passwords due to missing authentication in Linksys routers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27846?
CVE-2026-27846 is a medium-severity missing authorization vulnerability in Linksys MR9600, published on 25 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Due to missing authentication, a user with physical access to the device can misuse the mesh functionality for adding a new mesh device to the network to gain access to sensitive information, including the password for admin access to the web interface and the Wi-Fi passwords.This issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200.
Weakness: CWE-306
Which versions are affected by CVE-2026-27846?
How do I fix CVE-2026-27846?
No fix has been published for CVE-2026-27846 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-27846 being exploited?
There is no known exploitation of CVE-2026-27846 in the wild and no public exploit code.
Sources
Also known as GHSA-6j93-38rf-cf9g.