CVE-2026-18686 GL.iNet GL-MT3000 nas-web RPC Wrapper glc nas-web.add_user command injection
Remote attackers can execute arbitrary commands on GL.iNet GL-MT3000 routers via the nas-web add_user RPC function.
- 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-2026-18686?
CVE-2026-18686 is a critical command injection vulnerability in GL.iNet GL-MT3000, published on 4 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was detected in GL.iNet GL-MT3000 up to 4.4.5. The affected element is the function nas-web.add_user of the file /cgi-bin/glc of the component nas-web RPC Wrapper. Performing a manipulation results in command injection. The attack can be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.
Which versions are affected by CVE-2026-18686?
How do I fix CVE-2026-18686?
No fix has been published for CVE-2026-18686 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-18686 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18686 exists.
Sources
Also known as GHSA-7892-84cj-c35c.