# CVE-2025-34100: BuilderEngine 3.5.0 RCE via Unauthenticated Arbitrary File Upload

> Unauthenticated attackers can upload malicious PHP files via the integrated file manager to achieve remote code execution on BuilderEngine CMS servers.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Jul 2025
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-q4px-f6mf-p9w2

## What is CVE-2025-34100?

CVE-2025-34100 is a critical vulnerability in BuilderEngine CMS, published on 10 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An unrestricted file upload vulnerability exists in BuilderEngine 3.5.0 via the integration of the elFinder 2.0 file manager and its use of the jQuery File Upload plugin. The plugin fails to properly validate or restrict file types or locations during upload operations, allowing an attacker to upload a malicious .php file and subsequently execute arbitrary PHP code on the server under the context of the web server process. While the root vulnerability lies within the jQuery File Upload component, BuilderEngine’s improper integration and lack of access controls expose this functionality to unauthenticated users, resulting in full remote code execution.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-306 (Missing Authentication for Critical Functionality), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2025-34100?


## How do I fix CVE-2025-34100?

No fix has been published for CVE-2025-34100 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-34100 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34100 exists.

Public exploit code:

- BuilderEngine Arbitrary File Upload Vulnerability and execution (metasploit)
- Demo web server (github_poc): https://github.com/RyanJohnJames/CVE-2025-34100-demo
- CVE-2025-34100 test (github_poc): https://github.com/hyeonyeonglee/CVE-2025-34100

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-34100 and fix it if it is affected.

What it is: CVE-2025-34100 is a critical vulnerability in BuilderEngine CMS, published on 10 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34100 exists.

Affected product: BuilderEngine CMS. 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-2025-34100/ (Markdown: https://insights.sbomify.com/CVE-2025-34100/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-34100
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-34100
- OSV: https://osv.dev/vulnerability/CVE-2025-34100

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-34100/
Summaries are generated and may contain mistakes; the official description above is the record.