ClearFoundation ClearOS 7.9 Log Viewer File.php filter os command injection

Summaryinfo

A vulnerability was found in ClearFoundation ClearOS 7.9. It has been declared as very critical. Affected by this issue is some unknown functionality of the file File.php of the component Log Viewer. The manipulation of the argument filter results in os command injection. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is known as CVE-2026-67599. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as very critical has been found in ClearFoundation ClearOS 7.9. Affected is some unknown processing of the file File.php of the component Log Viewer. The manipulation of the argument filter with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

ClearOS 7.9 contains an OS command injection vulnerability in the Log Viewer component that allows authenticated attackers to execute arbitrary commands by submitting unsanitized input through the filter parameter, which is interpolated directly into a shell command in File.php. Attackers can inject command substitution payloads into the filter parameter to execute arbitrary commands as the webconfig user, and due to extensive NOPASSWD sudo privileges granted to that user by default, immediately escalate to root.

The advisory is available at lazytitan.ro. This vulnerability is traded as CVE-2026-67599 since 07/29/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation requires an enhanced level of successful authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/03/2026). This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

By approaching the search of inurl:File.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• ClearFoundation

Name

• ClearOS

Version

• 7.9

Support

• end of life

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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