CVE-2026-71287 — Cacti's sanitize_sql_column() (lib/functions.php) sanitizes user-supplied ORDER BY column…¶

Key facts

CVE-2026-71287 is a High (8.8) vulnerability: Cacti's sanitize_sql_column() (lib/functions.php) sanitizes user-supplied ORDER BY column…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-71287
Severity	High (8.8)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-71287/

Details¶

English | 한국어

Description¶

Cacti's sanitize_sql_column() (lib/functions.php) sanitizes user-supplied ORDER BY column names using the regex preg_replace('/[^a-zA-Z0-9_().]/', '', $column). Because this allowlist retains letters, digits, underscore, parentheses, and dot (intended to support expressions like COUNT(id) and table.column), a payload such as SLEEP(5) passes through completely unmodified. The sanitized value is concatenated directly into raw SQL ORDER BY clauses (which cannot be parameterized) driven by a sort_column GET parameter in at least user_log.php, utilities.php, user_domains.php, and user_group_admin.php, allowing any authenticated Cacti user, regardless of privilege level, to perform time-based blind SQL injection against the Cacti database.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-71287
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-2026-71287/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-2026-71287

# 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/Cacti/cacti
https://github.com/Cacti/cacti/blob/develop/lib/functions.php

Generated by PoC Generator on 2026-08-09T18:37:54.871828146

Frequently asked questions¶

What is CVE-2026-71287?¶

CVE-2026-71287 is a High (8.8) vulnerability: Cacti's sanitize_sql_column() (lib/functions.php) sanitizes user-supplied ORDER BY column…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-71287?¶

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-2026-71287?¶

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.