CVE-2026-61518 — ISPConfig contains an authenticated SQL injection vulnerability in the Remote API.¶

Key facts

CVE-2026-61518 is a High (8.8) vulnerability: ISPConfig contains an authenticated SQL injection vulnerability in the Remote API.. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-61518
Severity	High (8.8)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-61518/

Details¶

English | 한국어

Description¶

ISPConfig contains an authenticated SQL injection vulnerability in the Remote API. The primary_id parameter passed to delete and update API methods is concatenated directly into SQL WHERE clauses without integer casting or parameterized query binding. The built-in SQL injection scanner does not block quote-free boolean payloads and does not reject requests in its default configuration. A remote API user holding any single low-privilege function permission can inject arbitrary SQL to delete or modify records across all tenants in the control panel database and extract arbitrary data via blind boolean inference, including password hashes and client records.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-61518
Type	SQLI
CVSS Score	8.8

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-61518/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-2026-61518

# 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/geo-chen/oss/blob/main/ispconfig3.md
https://www.vulncheck.com/advisories/ispconfig-authenticated-sql-injection-via-remote-api-primary-id-parameter

Generated by PoC Generator on 2026-08-24T08:09:54.298351697

Frequently asked questions¶

What is CVE-2026-61518?¶

CVE-2026-61518 is a High (8.8) vulnerability: ISPConfig contains an authenticated SQL injection vulnerability in the Remote API.. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-61518?¶

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-2026-61518?¶

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.