CVE-2026-35867 Command injection in AC1900 firmware
An attacker can execute arbitrary commands on LB-LINK AC1900 routers via shell metacharacters in a specific POST request without administrative access.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-35867?
CVE-2026-35867 is a low-severity command injection vulnerability in LB-LINK AC1900 firmware, published on 13 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Command Injection vulnerability exists in the bs_SetLimitCli_info function within the libshare.so library of the LB-LINK router AC1900_AZ2 V1.0.2 via shell metacharacters, if the device is deployed in a scenario where an actor is able to make a "POST /goform/set_LimitClient_cfg" call but does not already have administrative access to the device.
Weakness: CWE-78
Which versions are affected by CVE-2026-35867?
How do I fix CVE-2026-35867?
No fix has been published for CVE-2026-35867 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-2026-35867 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35867 exists.
Sources
Also known as GHSA-cw3c-9w3h-vf4q.