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High, CVSS 7.5

1Panel arbitrary file write vulnerability

CVE-2023-39966GHSA-hf7j-xj3w-87g4

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/1Panel-dev/1Panel 1.5.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
  • CVE-2023-39966: 0.83% estimated exploitation activity in the next 30 days; percentile 57.72 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary An arbitrary file write vulnerability could lead to direct control of the server Details Arbitrary file creation 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.It looks like this: - Vulnerable Code PoC - We can write the SSH public key into the /etc/.root/authorizedkeys configuration file on the server. - The server was successfully written to the public key - Successfully connected to the target server using an SSH private key. As a result, the server is directly controlled, causing serious harm Impact 1Panel v1.4.3

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-hf7j-xj3w-87g4

Agent brief

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# Patch Next advisory brief: CVE-2023-39966

Advisory: 1Panel arbitrary file write vulnerability
IDs: CVE-2023-39966, GHSA-hf7j-xj3w-87g4
Record: https://patchnext.com/advisories/cve-2023-39966 (revision 1, source checked 26 Oct 2026, 15:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/1Panel-dev/1Panel 1.5.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/1Panel-dev/1Panel: affected >= 1.4.3, <= 1.4.3; fixed in 1.5.0

## Suggested inspection (read-only)
- Go github.com/1Panel-dev/1Panel: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/1Panel-dev/1Panel.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hf7j-xj3w-87g4 (GitHub-reviewed advisory GHSA-hf7j-xj3w-87g4 lists affected ranges: Go github.com/1Panel-dev/1Panel >=1.4.3 <=1.4.3)

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