CVE-2026-82874 — ToolJet before v3.16.208 fails to validate that authenticated users belong to the…¶

Key facts

CVE-2026-82874 is a Critical (9.9) vulnerability: ToolJet before v3.16.208 fails to validate that authenticated users belong to the…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-82874
Severity	Critical (9.9)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-82874/

Details¶

English | 한국어

Description¶

ToolJet before v3.16.208 fails to validate that authenticated users belong to the organization specified in the organizationId path parameter of tooljet-db endpoints, allowing any Builder user to read, modify, and delete tables across tenant boundaries. Attackers can extract victim organization IDs from public app endpoints, then exploit schema operation endpoints to disclose table schemas, plant malicious tables, corrupt existing schemas, or permanently destroy victim data without any relationship to the target organization.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-82874
Type	IDOR
CVSS Score	9.9

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-82874/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-2026-82874

# 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/ToolJet/ToolJet/security/advisories/GHSA-w3hx-rg9g-mw5c
https://www.vulncheck.com/advisories/tooljet-before-3.16.208-cross-tenant-authorization-bypass-via-tooljet-db

Generated by PoC Generator on 2026-09-03T11:10:29.878485476

Frequently asked questions¶

What is CVE-2026-82874?¶

CVE-2026-82874 is a Critical (9.9) vulnerability: ToolJet before v3.16.208 fails to validate that authenticated users belong to the…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-82874?¶

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-2026-82874?¶

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.