CVE-2026-38822 Command injection in openNDS
An authenticated user can execute arbitrary shell commands via crafted HTTP GET parameters in openNDS captive portal software.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-38822?
CVE-2026-38822 is a high-severity command injection vulnerability in openNDS, published on 28 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In openNDS before 11.0.0, the client_params.sh script, invoked by the openNDS daemon to serve the authenticated client status page, is vulnerable to OS command injection through crafted HTTP GET query parameter keys. An authenticated captive portal user can inject arbitrary shell commands by embedding semicolons in a URL query parameter name.
Weakness: CWE-78
Which versions are affected by CVE-2026-38822?
How do I fix CVE-2026-38822?
No fix has been published for CVE-2026-38822 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-2026-38822 being exploited?
There is no known exploitation of CVE-2026-38822 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-38822, GHSA-2h6c-w4mg-27v5, UBUNTU-CVE-2026-38822.