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

> Authenticated attackers can execute arbitrary commands and escalate to root via OS command injection in the ClearOS Log Viewer filter parameter.

- **Severity:** High 8.6 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Aug 2026
- **Updated:** 4 Aug 2026
- **Also known as:** GHSA-pfmm-hj96-f74x

## What is CVE-2026-67599?

CVE-2026-67599 is a high-severity command injection vulnerability in ClearFoundation ClearOS, published on 3 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official 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.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-67599?


## How do I fix CVE-2026-67599?

No fix has been published for CVE-2026-67599 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-67599 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67599 exists.

Public exploit code:

- Authenticated Blind OS Command Injection in ClearOS (github_poc): https://github.com/LazyTitan33/CVE-2026-67599_ClearOS_RCE

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-67599 and fix it if it is affected.

What it is: CVE-2026-67599 is a high-severity command injection vulnerability in ClearFoundation ClearOS, published on 3 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67599 exists.

Affected product: ClearFoundation ClearOS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-67599/ (Markdown: https://insights.sbomify.com/CVE-2026-67599/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-67599
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-67599
- OSV: https://osv.dev/vulnerability/CVE-2026-67599

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-67599/
Summaries are generated and may contain mistakes; the official description above is the record.