{"id":"CVE-2026-111623","kind":"vulnerability","aliases":["CVE-2026-111623"],"related":[],"title":"Xiaozhi ESP32 server Java: unauthenticated OTA endpoint leaks device WebSocket tokens","description":"Xiaozhi-esp32-server-java through 6.1.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to obtain valid device WebSocket tokens by requesting /api/device/ota with any MAC address. Attackers can open a victim device's WebSocket channel to read private role system prompts, write conversation history, consume LLM/STT/TTS credentials, and overwrite device metadata.","summary":"Xiaozhi-esp32-server-java through 6.1.0 returns valid device WebSocket tokens to anyone who requests /api/device/ota with any MAC address, with no authentication. An attacker can then connect to a victim device's channel to read its private system prompts, write conversation history, use the LLM, speech-to-text and text-to-speech credentials, and overwrite device metadata.","severity":"medium","cvss":6.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ai-tooling","esp32","iot","java","llm","self-hosted","xiaozhi-esp32-server-java"],"not_affected_if":["not-internet-reachable","version-above-6.1.0"],"how_to_check":"- Check whether the deployment runs Xiaozhi-esp32-server-java at version `6.1.0` or earlier.\n- Request `/api/device/ota` from outside the network with an arbitrary MAC address and see whether a WebSocket token comes back without login.","fix":"- Upgrade Xiaozhi-esp32-server-java to a version later than `6.1.0` (the fixed version is unknown from the sources).\n- Until patched, block external access to `/api/device/ota` at the reverse proxy or firewall, and rotate the LLM, STT and TTS API keys stored in the server.","status":"open","published_at":"2026-10-16T18:17:42+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","triaged_at":"2026-10-25T04:01:57+00:00","updated_at":"2026-10-25T04:01:57+00:00","category":"ai-tooling","confidence":0.7,"triage":{"at":"2026-10-25T04:01:57Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Xiaozhi-esp32-server-java to a version later than `6.1.0` (the fixed version is unknown from the sources).\n- Until patched, block external access to `/api/device/ota` at the reverse proxy or firewall, and rotate the LLM, STT and TTS API keys stored in the server.","reach":"internet","title":"Xiaozhi ESP32 server Java: unauthenticated OTA endpoint leaks device WebSocket tokens","impact":"high","summary":"Xiaozhi-esp32-server-java through 6.1.0 returns valid device WebSocket tokens to anyone who requests /api/device/ota with any MAC address, with no authentication. An attacker can then connect to a victim device's channel to read its private system prompts, write conversation history, use the LLM, speech-to-text and text-to-speech credentials, and overwrite device metadata.","category":"ai-tooling","nicknames":[],"who_cares":["xiaozhi-esp32-server-java","self-hosted","java","llm","esp32","iot"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker reads prompts, uses LLM credentials and hijacks device sessions","analyst_note":"Confirm the fixed version and whether a patch exists; the sources give only the NVD entry and do not say which release fixes it.","how_to_check":"- Check whether the deployment runs Xiaozhi-esp32-server-java at version `6.1.0` or earlier.\n- Request `/api/device/ota` from outside the network with an arbitrary MAC address and see whether a WebSocket token comes back without login.","needs_analyst":true,"not_affected_if":["version-above-6.1.0","not-internet-reachable"],"who_is_affected":"Any self-hosted Xiaozhi-esp32-server-java instance at version 6.1.0 or earlier that is reachable from a network the attacker can reach, since the OTA endpoint needs no authentication. Teams that run only the ESP32 device firmware against a managed backend, or that keep the server behind a VPN with no outside access, are much less exposed.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000716,"input_tokens":3368,"output_tokens":759,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-111623':14A,17A '-2026':13A,16A '/api/device/ota':49B,118C '6.1.0':39B,100C 'address':53B,122C 'ai':19B 'ai-tool':18B 'allow':107C 'anyon':46B 'attack':58B,109C,123C 'authent':56B,103C 'bypass':104C 'channel':67B,131C 'connect':61B 'consum':141C 'contain':101C 'convers':75B,139C 'credenti':89B,143C 'cve':12A,15A 'devic':9A,42B,65B,92B,113C,128C,146C 'endpoint':7A 'esp32':2A,21B,30B,35B,96C 'histori':76B,140C 'host':27B 'iot':22B 'java':4A,23B,32B,37B,98C 'leak':8A 'llm':24B,79B 'llm/stt/tts':142C 'mac':52B,121C 'metadata':93B,147C 'obtain':111C 'open':125C 'ota':6A 'overwrit':91B,145C 'privat':71B,134C 'prompt':73B,137C 'read':69B,133C 'request':48B,117C 'return':40B 'role':135C 'self':26B 'self-host':25B 'server':3A,31B,36B,97C 'speech':81B,88B 'speech-to-text':80B 'system':72B,136C 'text':83B,86B 'text-to-speech':85B 'token':11A,44B,115C 'tool':20B 'unauthent':5A,108C 'use':77B 'valid':41B,112C 'victim':64B,127C 'vulner':105C 'websocket':10A,43B,114C,130C 'write':74B,138C 'xiaozhi':1A,29B,34B,95C 'xiaozhi-esp32-server-java':28B,33B,94C","nicknames":[],"mitigations":[],"who_affected":"Any self-hosted Xiaozhi-esp32-server-java instance at version 6.1.0 or earlier that is reachable from a network the attacker can reach, since the OTA endpoint needs no authentication. Teams that run only the ESP32 device firmware against a managed backend, or that keep the server behind a VPN with no outside access, are much less exposed.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T18:17:42+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-111623","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111623","severity":null,"published_at":"2026-10-16T18:17:42+00:00","modified_at":"2026-10-23T19:17:42+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}