OS command injection in the advanced-rule parser of ConfigServer Security & Firewall allows a remote attacker who controls a configured allow/deny… (CVE-2026-65639)
An OS command injection vulnerability exists in the advanced-rule parser of ConfigServer Security & Firewall (CSF). A remote attacker who controls a configured allow/deny feed can execute arbitrary commands as root due to insufficient validation of feed-supplied rule data. The issue affects versions originally distributed by ConfigServer and WebPros-maintained forks containing the vulnerable code. WebPros has fixed the vulnerability in version 16.30. Other forks or independently maintained versions may also be vulnerable and require independent evaluation.
AI Analysis
Technical Summary
CVE-2026-65639 describes an OS command injection vulnerability in the advanced-rule parser of ConfigServer Security & Firewall. This flaw allows a remote attacker with control over a configured allow/deny feed to execute arbitrary commands with root privileges. The root cause is insufficient validation of the rule data supplied by the feed. The vulnerability affects the original ConfigServer versions and WebPros forks containing the vulnerable code. WebPros addressed the issue 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 OS commands as root on affected systems. This can lead to full system compromise, unauthorized access, and control over the firewall and potentially the host system. The vulnerability is critical due to the high privileges granted and the remote attack vector.
Mitigation Recommendations
WebPros has released an official fix in version 16.30 of ConfigServer Security & Firewall. Users should upgrade to version 16.30 or later to remediate this vulnerability. Other forks or independently maintained versions should be independently evaluated and patched accordingly. No additional mitigation guidance is provided by the vendor advisory.
OS command injection in the advanced-rule parser of ConfigServer Security & Firewall allows a remote attacker who controls a configured allow/deny… (CVE-2026-65639)
Description
An OS command injection vulnerability exists in the advanced-rule parser of ConfigServer Security & Firewall (CSF). A remote attacker who controls a configured allow/deny feed can execute arbitrary commands as root due to insufficient validation of feed-supplied rule data. The issue affects versions originally distributed by ConfigServer and WebPros-maintained forks containing the vulnerable code. WebPros has fixed the vulnerability in version 16.30. Other forks or independently maintained versions may also be vulnerable and require independent evaluation.
CVSS v4.0
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-65639 describes an OS command injection vulnerability in the advanced-rule parser of ConfigServer Security & Firewall. This flaw allows a remote attacker with control over a configured allow/deny feed to execute arbitrary commands with root privileges. The root cause is insufficient validation of the rule data supplied by the feed. The vulnerability affects the original ConfigServer versions and WebPros forks containing the vulnerable code. WebPros addressed the issue 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 OS commands as root on affected systems. This can lead to full system compromise, unauthorized access, and control over the firewall and potentially the host system. The vulnerability is critical due to the high privileges granted and the remote attack vector.
Mitigation Recommendations
WebPros has released an official fix in version 16.30 of ConfigServer Security & Firewall. Users should upgrade to version 16.30 or later to remediate this vulnerability. Other forks or independently maintained versions should be independently evaluated and patched accordingly. No additional mitigation guidance is provided by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-hxr2-4c3f-5rpg
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-65639"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa3296591cc7f3848d19126
Added to database: 09/10/2026, 22:04:21 UTC
Last enriched: 09/10/2026, 22:09:10 UTC
Last updated: 09/11/2026, 03:31:45 UTC
Views: 5
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