# CVE-2026-46399: Authenticated Remote Code Execution via File Overwrite

> Authenticated attackers can achieve remote code execution on HAX CMS servers by configuring malicious Git filter commands via file overwrite.

- **Severity:** Critical 9.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Jun 2026
- **Updated:** 8 Jun 2026

## What is CVE-2026-46399?

CVE-2026-46399 is a critical command injection vulnerability in haxtheweb haxcms-nodejs, published on 5 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

HAX CMS helps manage microsite universe with PHP or NodeJs backends. The PHP version of HAX CMS prior to version 26.0.0 has an authenticated file overwrite vulnerability. An attacker can exploit this vulnerability to configure malicious Git filter commands and achieve code execution on the HAX CMS server. Version 26.0.0 patches the issue.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-73 (External Control of File Name or Path), CWE-15 (External Control of System or Configuration Setting)

## Which versions are affected by CVE-2026-46399?


## How do I fix CVE-2026-46399?

No fix has been published for CVE-2026-46399 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-46399 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46399 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-46399 and fix it if it is affected.

What it is: CVE-2026-46399 is a critical command injection vulnerability in haxtheweb haxcms-nodejs, published on 5 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46399 exists.

Affected product: haxtheweb haxcms-nodejs. 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-2026-46399/ (Markdown: https://insights.sbomify.com/CVE-2026-46399/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-46399
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-46399
- OSV: https://osv.dev/vulnerability/CVE-2026-46399

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-46399/
Summaries are generated and may contain mistakes; the official description above is the record.