CVE-2023-39965 — 1Panel
MEDIUMCVE-2023-39965 is a medium-severity (CVSS 6.5) CWE-863 vulnerability in github.com/1Panel-dev/1Panel. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for github.com/1Panel-dev/1Panel — see the affected versions and patch details below.
1Panel Unauthorized access in Backend
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-39965.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
github.com/1Panel-dev/1PanelReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Summary
Any file downloading vulnerability exists in 1Panel backend.
Details
Authenticated attackers can download arbitrary files through the API interface. This code has unauthorized access.
PoC
payload:
POST /api/v1/files/download/bypath HTTP/1.1 Host: ip Content-Type: application/json
{"path":"/etc/passwd"}
Impact
Attackers can freely download the file content on the target system. This will be caused a large amount of information leakage.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/1Panel-dev/1Panel | ≥ 1.4.3&&< 1.5.0 | 1.5.0go get github.com/1Panel-dev/1Panel@v1.5.0 |
Affected Products
1panelfit2cloudResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/1Panel-dev/1Panel, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/1Panel-dev/1Panel to 1.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-39965 is resolved across your whole dependency graph.
Workarounds
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.
Frequently Asked Questions
Is CVE-2023-39965 in your dependencies?
Find it across Go, including transitive dependencies.