# CVE-2026-28674: xiaoheiFS Vulnerable to RCE via Arbitrary Payment Plugin Upload (Automatic Execution)

> Attackers can achieve remote code execution by uploading malicious files to the payment plugin directory, which are automatically executed by a background watcher.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Mar 2026
- **Updated:** 18 Mar 2026

## What is CVE-2026-28674?

CVE-2026-28674 is a high-severity vulnerability in danvei233 xiaoheiFS, published on 18 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

xiaoheiFS is a self-hosted financial and operational system for cloud service businesses. In versions up to and including 0.3.15, the `AdminPaymentPluginUpload` endpoint lets admins upload any file to `plugins/payment/`. It only checks a hardcoded password (`qweasd123456`) and ignores file content. A background watcher (`StartWatcher`) then scans this folder every 5 seconds. If it finds a new executable, it runs it immediately, resulting in RCE. Version 4.0.0 fixes the issue.

Weakness: CWE-798 (Use of Hard-coded Credentials), CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-28674?

It affects 1 product.


Products: Danvei233 Xiaoheifs.

## How do I fix CVE-2026-28674?

No fix has been published for CVE-2026-28674 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-28674 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-28674 exists.

## Other vulnerabilities in danvei233 xiaoheiFS

- [CVE-2026-28673](https://insights.sbomify.com/CVE-2026-28673/): xiaoheiFS Vulnerable to RCE via Unrestricted Plugin Installation (Manifest Manipulation) (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-28674 and fix it if it is affected.

What it is: CVE-2026-28674 is a high-severity vulnerability in danvei233 xiaoheiFS, published on 18 Mar 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-2026-28674 exists.

Affected product: danvei233 xiaoheiFS. 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-2026-28674/ (Markdown: https://insights.sbomify.com/CVE-2026-28674/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-28674
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-28674
- OSV: https://osv.dev/vulnerability/CVE-2026-28674

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-28674/
Summaries are generated and may contain mistakes; the official description above is the record.