RCE in Opennds

CVE-2026-38822

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.

Vulnerability class: Command Injection (OS Command Injection)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.023 (82.6th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-38822: rose from 0.008 to 0.023.

EPSS over last 30 days · oldest: 0.008 · newest: 0.023 · change: +0.014

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-38822?
CVE-2026-38822 is a high-severity vulnerability in Opennds, classified under OS Command Injection. CVSS score: 7.6/10. Published 2026-08-28.
How severe is CVE-2026-38822?
High severity. CVSS v3 base score is 7.6 out of 10.