CVE-2026-7548 Totolink NR1800X cstecgi.cgi sub_41A68C command injection
Remote attackers can execute arbitrary commands on Totolink NR1800X routers via the setUssd parameter in cstecgi.cgi.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7548?
CVE-2026-7548 is a high-severity command injection vulnerability in Totolink NR1800X, published on 1 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was detected in Totolink NR1800X 9.1.0u.6279_B20210910. This affects the function sub_41A68C of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument setUssd results in command injection. The attack is possible to be carried out remotely. The exploit is now public and may be used.
Which versions are affected by CVE-2026-7548?
How do I fix CVE-2026-7548?
No fix has been published for CVE-2026-7548 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-2026-7548 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7548 exists.
Sources
Also known as GHSA-qvw7-x5j6-v7rp.