# CVE-2026-65639: Command injection in ConfigServer Security & Firewall

> Remote attackers controlling allow/deny feeds can execute arbitrary commands as root via OS command injection in the advanced-rule parser.

- **Severity:** Critical 9.5 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-hxr2-4c3f-5rpg

## What is CVE-2026-65639?

CVE-2026-65639 is a critical command injection vulnerability in ConfigServer Security & Firewall, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OS command injection in the advanced-rule parser of ConfigServer Security & Firewall allows a remote attacker who controls a configured allow/deny feed to execute arbitrary commands as root, due to insufficient validation of feed-supplied rule data.

The vulnerability affects versions of the software originally distributed by ConfigServer, as well as versions of the WebPros-maintained fork that contain the vulnerable code. WebPros has addressed the vulnerability in version 16.30. Other forks or independently maintained versions of ConfigServer Security & Firewall (CSF) may also be affected and should be evaluated independently.

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

## Which versions are affected by CVE-2026-65639?


## How do I fix CVE-2026-65639?

No fix has been published for CVE-2026-65639 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-65639 being exploited?

There is no known exploitation of CVE-2026-65639 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-65639 and fix it if it is affected.

What it is: CVE-2026-65639 is a critical command injection vulnerability in ConfigServer Security & Firewall, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-65639 in the wild and no public exploit code.

Affected product: ConfigServer Security & Firewall. 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-2026-65639/ (Markdown: https://insights.sbomify.com/CVE-2026-65639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-65639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-65639
- OSV: https://osv.dev/vulnerability/CVE-2026-65639

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-65639/
Summaries are generated and may contain mistakes; the official description above is the record.