CVE-2026-65916 — CyberPanel through 1.9.1, fixed in commit b198460, contains a missing authorization…¶

Key facts

CVE-2026-65916 is a High (8.1) vulnerability: CyberPanel through 1.9.1, fixed in commit b198460, contains a missing authorization…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-65916
Severity	High (8.1)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-65916/

Details¶

English | 한국어

Description¶

CyberPanel through 1.9.1, fixed in commit b198460, contains a missing authorization vulnerability in the cancelBackupCreation handler that allows authenticated users to kill, delete, and corrupt other tenants' backups. Attackers can send crafted POST requests with arbitrary backupCancellationDomain and fileName parameters to terminate backup processes, delete backup archives, corrupt backup status files, and remove database records belonging to other tenants.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-65916
CVSS Score	8.1

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-65916/poc.py

Usage¶

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab¶

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start¶

# Clone and navigate to CVE directory
cd CVE-2026-65916

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints¶

Application	URL	Status
Vulnerable App	http://localhost:8080	Shows vulnerability
Patched App	http://localhost:8081	Demonstrates fix

Directory Structure¶

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References¶

https://github.com/usmannasir/cyberpanel/commit/b1984603f9b0099b39bca46fea176e53b6d4d601
https://github.com/usmannasir/cyberpanel/issues/1829
https://www.vulncheck.com/advisories/cyberpanel-missing-authorization-in-cancelbackupcreation-handler

Generated by PoC Generator on 2026-08-04T22:13:40.401397282

Frequently asked questions¶

What is CVE-2026-65916?¶

CVE-2026-65916 is a High (8.1) vulnerability: CyberPanel through 1.9.1, fixed in commit b198460, contains a missing authorization…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-65916?¶

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2026-65916?¶

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.