OS Command Injection Vulnerability in ClearOS by ClearCenter
CVE-2026-67599

8.6HIGH

Key Information:

Vendor

Clearfoundation

Status
Clearos
Vendor
CVE Published:
3 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-67599?

CVE-2026-67599 is an OS command injection vulnerability found in ClearOS 7.9, a Linux-based operating system developed by ClearCenter, designed primarily for small to medium-sized businesses. This vulnerability resides in the Log Viewer component, where it allows authenticated attackers to input unsanitized parameters through the filter field. Since this input is directly interpolated into a shell command within the File.php script, attackers can manipulate this feature to execute arbitrary commands on the operating system. The threat is particularly severe, as the webconfig user associated with this process has extensive sudo privileges set to “NOPASSWD,” enabling attackers to escalate their permissions to root level immediately after exploitation. This capability can have devastating consequences for an organization, as it potentially allows full control over the affected system.

Potential impact of CVE-2026-67599

  1. Escalation of Privileges: The vulnerability enables attackers to execute arbitrary commands with root privileges, facilitating complete system takeover. This could allow them to alter system configurations, access sensitive data, and disrupt services.

  2. Data Breaches: With the potential to run commands with elevated permissions, attackers could access or exfiltrate sensitive data housed within the ClearOS environment, posing severe risks of confidential information being disclosed.

  3. Malware Deployment: A successful exploitation could lead to the installation of persistent malware, which attackers could use to maintain a foothold in the network, spread throughout connected systems, or leverage for further attacks, including ransomware deployment.

Affected Version(s)

ClearOS 7.9

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-67599 - Proof of Concept

References

https://lazytitan.ro/clearos
technical-descriptionexploit
https://clearos.com/
product
https://www.vulncheck.com/advisories/clearos-os-command-i...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Paul Serban (LazyTitan)
.