CVE-2026-65639: CWE-78 OS Command Injection in WebPros ConfigServer Security & Firewall
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-65639) is an OS command injection flaw in the advanced-rule parser component of ConfigServer Security & Firewall. It arises from insufficient validation of data supplied by configured allow/deny feeds, enabling a remote attacker controlling such a feed to execute arbitrary commands with root privileges. The issue affects version 2.15 of the original ConfigServer software and WebPros-maintained forks with the vulnerable code. WebPros addressed the vulnerability in version 16.30. Other forks or independently maintained versions may also be affected and should be assessed separately.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary commands as root on the affected system, leading to full system compromise. The vulnerability is critical with a CVSS 4.0 score of 9.5, indicating high attack vector and impact metrics. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available from WebPros in version 16.30. Users of ConfigServer Security & Firewall version 2.15 or affected forks should upgrade to version 16.30 or later where the vulnerability is addressed. Other forks or independently maintained versions should be evaluated independently for this vulnerability and patched accordingly if affected.
CVE-2026-65639: CWE-78 OS Command Injection in WebPros ConfigServer Security & Firewall
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.
CVSS v4.0
Score 9.5critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-65639) is an OS command injection flaw in the advanced-rule parser component of ConfigServer Security & Firewall. It arises from insufficient validation of data supplied by configured allow/deny feeds, enabling a remote attacker controlling such a feed to execute arbitrary commands with root privileges. The issue affects version 2.15 of the original ConfigServer software and WebPros-maintained forks with the vulnerable code. WebPros addressed the vulnerability in version 16.30. Other forks or independently maintained versions may also be affected and should be assessed separately.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary commands as root on the affected system, leading to full system compromise. The vulnerability is critical with a CVSS 4.0 score of 9.5, indicating high attack vector and impact metrics. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available from WebPros in version 16.30. Users of ConfigServer Security & Firewall version 2.15 or affected forks should upgrade to version 16.30 or later where the vulnerability is addressed. Other forks or independently maintained versions should be evaluated independently for this vulnerability and patched accordingly if affected.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- hackerone
- Date Reserved
- 2026-07-22T15:00:06.103Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa2dccdf76d26f025573a84
Added to database: 09/10/2026, 16:37:33 UTC
Last enriched: 09/10/2026, 16:51:30 UTC
Last updated: 09/10/2026, 17:17:20 UTC
Views: 5
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