CVE-2026-27847 Missing authentication in Linksys MR9600, Linksys MX4200
Attackers can inject SQL via TLS-SRP handshake to bypass authentication and access protected services on Linksys routers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27847?
CVE-2026-27847 is a critical SQL injection vulnerability in Linksys MR9600, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Due to improper neutralization of special elements, SQL statements can be injected via the handshake of a TLS-SRP connection. This can be used to inject known credentials into the database that can be utilized to successfully complete the handshake and use the protected service. This issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200.
Weakness: CWE-89
Which versions are affected by CVE-2026-27847?
How do I fix CVE-2026-27847?
No fix has been published for CVE-2026-27847 yet. Limit exposure of the affected software until one is available.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2026-27847 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27847 exists.
Sources
Also known as GHSA-w654-6gvp-6w5j.