CVE-2026-65639 Command injection in ConfigServer Security & Firewall
Remote attackers controlling allow/deny feeds can execute arbitrary commands as root via OS command injection in the advanced-rule parser.
- 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-2026-65639?
CVE-2026-65639 is a critical command injection vulnerability in ConfigServer Security & Firewall, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OS command injection in the advanced-rule parser of ConfigServer Security & Firewall allows a remote attacker who controls a configured allow/deny feed to execute arbitrary commands as root, due to insufficient validation of feed-supplied rule data.
The vulnerability affects versions of the software originally distributed by ConfigServer, as well as versions of the WebPros-maintained fork that contain the vulnerable code. WebPros has addressed the vulnerability in version 16.30. Other forks or independently maintained versions of ConfigServer Security & Firewall (CSF) may also be affected and should be evaluated independently.
Weakness: CWE-78
Which versions are affected by CVE-2026-65639?
How do I fix CVE-2026-65639?
No fix has been published for CVE-2026-65639 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-2026-65639 being exploited?
There is no known exploitation of CVE-2026-65639 in the wild and no public exploit code.
Sources
Also known as GHSA-hxr2-4c3f-5rpg.