CVE-2026-89036 — Appwrite before 2.0.0 contains an argument injection vulnerability that allows…¶
Key facts
CVE-2026-89036 is a High (8.8) vulnerability: Appwrite before 2.0.0 contains an argument injection vulnerability that allows…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-89036 |
| Severity | High (8.8) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-89036/ |
Details¶
English | 한국어
Description¶
Appwrite before 2.0.0 contains an argument injection vulnerability that allows authenticated users with functions.write or sites.write permissions to execute arbitrary commands by injecting TAB characters into the providerRootDirectory parameter used to construct GNU tar commands. The application uses escapeshellcmd instead of escapeshellarg and fails to quote the parameter, allowing TAB characters to survive sanitization and be interpreted as argument separators, enabling injection of arbitrary GNU tar arguments such as --checkpoint-action=exec to achieve remote code execution as the builds worker process user.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-89036 |
| Type | RCE |
| CVSS Score | 8.8 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-89036/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-2026-89036
# 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/appwrite/appwrite/commit/a82dc6e386a6ac7b88e853a1e6fdb59e0b79ddca
- https://github.com/appwrite/appwrite/pull/13028
- https://github.com/appwrite/appwrite/releases#release-2.0.0
- https://www.vulncheck.com/advisories/appwrite-argument-injection-via-providerrootdirectory-parameter
Generated by PoC Generator on 2026-09-18T15:58:57.72763859
Frequently asked questions¶
What is CVE-2026-89036?¶
CVE-2026-89036 is a High (8.8) vulnerability: Appwrite before 2.0.0 contains an argument injection vulnerability that allows…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-89036?¶
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-2026-89036?¶
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.