description: "CVE-2026-71233 is a High (8.7) vulnerability: InvoiceNinja v5-stable renders an invoice or quote's 'terms' field in the client portal…. This entry ships a detection-only PoC and..." keywords: "CVE-2026-71233, CVE-2026-71233 detection, CVE-2026-71233 poc, InvoiceNinja v5-stable renders an invoice or quote's "terms" field in the client portal…"
CVE-2026-71233 — InvoiceNinja v5-stable renders an invoice or quote's "terms" field in the client portal…¶
Key facts
CVE-2026-71233 is a High (8.7) vulnerability: InvoiceNinja v5-stable renders an invoice or quote's "terms" field in the client portal…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-71233 |
| Severity | High (8.7) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-71233/ |
Details¶
English | 한국어
Description¶
InvoiceNinja v5-stable renders an invoice or quote's "terms" field in the client portal using Laravel Blade's raw output directive {!! $entity->terms !!} (resources/views/portal/ninja2020/invoices/includes/terms.blade.php) with no HTML sanitization. StoreInvoiceRequest.php only strips newlines from the field and does not purify HTML. An authenticated user with invoice creation access can set the terms field via the REST API (PUT /api/v1/invoices/{id}) to an HTML/JavaScript payload that executes in the client's browser when they view the invoice, enabling session cookie theft and client account takeover. This is a distinct code path from the previously published invoice line-item description field XSS (GHSA-98wm-cxpw-847p / CVE-2026-33628).
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-71233 |
| Type | XSS |
| CVSS Score | 8.7 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-71233/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-2026-71233
# 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/invoiceninja/invoiceninja
Generated by PoC Generator on 2026-08-10T01:48:07.208941377
Frequently asked questions¶
What is CVE-2026-71233?¶
CVE-2026-71233 is a High (8.7) vulnerability: InvoiceNinja v5-stable renders an invoice or quote's "terms" field in the client portal…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-71233?¶
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-2026-71233?¶
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.