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Vulnerability record · CVE-2026-67599 · published 3 August 2026

CVE-2026-67599: OS command injection vulnerability

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.

8.6 CVSS 4.0 High EPSS 2.4% · top 16.4% CWE-78 · OS command injection Awaiting Analysis
8.6CVSS 4.0 base score
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
24 Sep 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://clearos.com/
https://lazytitan.ro/clearos
https://www.vulncheck.com/advisories/clearos-os-command-injection-via-log-viewer-filter-parameter

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Source: NIST National Vulnerability Database (record CVE-2026-67599), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.