CoreShop Vulnerable to Remote Code Execution (RCE) via Insecure `pull_request_target` Configuration
Date: 2026-05
Affected: composer/coreshop/core-shop
Attack vector: rce
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-41249
CWE: CWE-94
CVSS: 8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N)

### Summary The GitHub Actions workflow (`.github/workflows/static.yml`) uses the `pull_request_target` trigger but dangerously checks out the unverified code from the pull request head (`ref: ${{ github.event.pull_request.head.ref }}`). Subsequently, it executes a script (`bin/console`) from this untrusted checkout. This allows any external attacker to achieve Remote Code Execution (RCE) on the GitHub Actions runner simply by submitting a malicious Pull Request. Also known as a "Pwn Request" vulnerability. **Steps to Reproduce:** 1. Fork the target repository. 2. In the forked repository, modify a file that satisfies the `paths` condition (e.g., `src/dummy.php` or `composer.json`) to trigger the workflow. 3. Modify the `bin/console` file (which is executed in the workflow steps) with the following malicious payload: ```bash #!/bin/bash echo "=== PWNED ===" echo "whoami:" whoami ``` 4. Commit the changes and open a Pull Request against the `5.0` or `next` branch of the base repository. 5. The `Static Tests` workflow will trigger automatically. Navigate to the Actions tab and inspect the logs for the `Validate YAML` (or any step executing `bin/console`). 6. You will see the output of `whoami` (typically `runner`), proving that the arbitrary code was successfully executed in the runner's context. <img width="490" height="87" alt="スクリーンショット 2026-04-14 11 14 56" src="https://github.com/user-attachments/assets/94276033-b989-46dc-b4a1-3dafa1603235" /> **Impact:** Because `pull


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