# CVE-2023-39966: 1Panel arbitrary file write vulnerability exists in the background

> Attackers can write arbitrary files to the server via the file save API, potentially gaining full control of the system.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Aug 2023
- **Updated:** 4 Oct 2024
- **Also known as:** GHSA-hf7j-xj3w-87g4, GO-2023-2006

## What is CVE-2023-39966?

CVE-2023-39966 is a high-severity path traversal vulnerability in 1Panel-dev 1Panel, published on 10 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

1Panel is an open source Linux server operation and maintenance management panel. In version 1.4.3, an arbitrary file write vulnerability could lead to direct control of the server. In the `api/v1/file.go` file, there is a function called `SaveContentthat,It `recieves JSON data sent by users in the form of a POST request. And the lack of parameter filtering allows for arbitrary file write operations. Version 1.5.0 contains a patch for this issue.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2023-39966?

3 open source packages ship an affected version, including github.com/1Panel-dev/1Panel. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/1Panel-dev/1Panel` | Go | From 1.4.3 | 1.5.0 |
| `github.com/1Panel-dev/1Panel` | Go | From 1.4.3 | 1.5.0 |
| `github.com/1Panel-dev/1Panel` | Go | From 1.4.3 | 1.5.0 |

Products: Fit2cloud 1panel.

## How do I fix CVE-2023-39966?

Upgrade github.com/1Panel-dev/1Panel to 1.5.0 or later.

## Is CVE-2023-39966 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-39966 exists.

## Other vulnerabilities in 1Panel-dev 1Panel

- [CVE-2024-39911](https://insights.sbomify.com/CVE-2024-39911/): 1Panel SQL injection (critical 10.0)
- [CVE-2024-39907](https://insights.sbomify.com/CVE-2024-39907/): a sqlinjection in 1Panel (critical 9.8)
- [CVE-2025-56413](https://insights.sbomify.com/CVE-2025-56413/): Command injection in n/a (high 8.8)
- [CVE-2025-54424](https://insights.sbomify.com/CVE-2025-54424/): 1Panel Agent Bypasses Certificate Verification Leading to Arbitrary Command Execution (high 8.1)
- [CVE-2025-66507](https://insights.sbomify.com/CVE-2025-66507/): 1Panel – CAPTCHA Bypass via Client-Controlled Flag (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-39966 and fix it if it is affected.

What it is: CVE-2023-39966 is a high-severity path traversal vulnerability in 1Panel-dev 1Panel, published on 10 Aug 2023. 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-2023-39966 exists.

Affected packages and fixed versions:
- github.com/1Panel-dev/1Panel (Go): affected from 1.4.3; fixed in 1.5.0
- github.com/1Panel-dev/1Panel (Go): affected from 1.4.3; fixed in 1.5.0
- github.com/1Panel-dev/1Panel (Go): affected from 1.4.3; fixed in 1.5.0

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-2023-39966/ (Markdown: https://insights.sbomify.com/CVE-2023-39966/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-39966
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-39966
- OSV: https://osv.dev/vulnerability/CVE-2023-39966

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-39966/
Summaries are generated and may contain mistakes; the official description above is the record.