# CVE-2026-65639

## Summary

- **CVE ID:** CVE-2026-65639
- **Severity:** CRITICAL
- **CVSS Score:** 9.5 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H)
- **CWE:** CWE-78
- **Published:** Sep 10, 2026
- **Last Modified:** Sep 10, 2026

## 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.

## Affected Products

- WebPros — ConfigServer Security & Firewall (2.15)
- ConfigServer — ConfigServer Security & Firewall (2.15)

## References

- [CNA](https://support.cpanel.net/hc/en-us/articles/43387923160343-Security-CVE-2026-65639-CSF-Security-Release)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._