{"id":"CVE-2026-119664","kind":"vulnerability","aliases":["CVE-2026-119664"],"related":[],"title":"Tamery: authenticated users can write messages into other users' AI chat history","description":"Tamery (formerly Conar) 0.26.1 before 0.99.0 contains an authorization bypass vulnerability in the cloud sync API chatsMessages.update handler, which leaves the client-supplied chatId writable. Authenticated Pro subscribers who know another user's chat ID can move messages with arbitrary parts and metadata into the victim's AI chat history.","summary":"Tamery (formerly Conar) versions 0.26.1 before 0.99.0 have an authorization flaw in the cloud sync chatsMessages.update handler, which accepts a client-supplied chatId without checking ownership. An authenticated Pro subscriber who knows another user's chat ID can insert messages with arbitrary parts and metadata into the victim's AI chat history.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["ai-chat","ai-tooling","cloud-sync","tamery"],"not_affected_if":["no-cloud-sync","version-0.99.0-or-later"],"how_to_check":"- Check the installed Tamery version; affected versions are 0.26.1 up to but not including `0.99.0`.\n- Review whether your team runs or relies on Tamery's cloud sync feature.","fix":"- Tamery: move to `0.99.0` or later, per the affected range stated in the source.","status":"open","published_at":"2026-10-30T15:16:50+00:00","first_seen_at":"2026-10-30T15:31:11+00:00","triaged_at":"2026-10-30T15:33:38+00:00","updated_at":"2026-10-30T15:33:38+00:00","category":"ai-tooling","confidence":0.7,"triage":{"at":"2026-10-30T15:33:38Z","model":"claude-haiku-5-5","output":{"fix":"- Tamery: move to `0.99.0` or later, per the affected range stated in the source.","reach":"internet","title":"Tamery: authenticated users can write messages into other users' AI chat history","impact":"medium","summary":"Tamery (formerly Conar) versions 0.26.1 before 0.99.0 have an authorization flaw in the cloud sync chatsMessages.update handler, which accepts a client-supplied chatId without checking ownership. An authenticated Pro subscriber who knows another user's chat ID can insert messages with arbitrary parts and metadata into the victim's AI chat history.","audience":"everyone","category":"ai-tooling","nicknames":[],"who_cares":["tamery","ai-chat","cloud-sync"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"Attacker plants arbitrary messages into another user's AI chat history","analyst_note":"","how_to_check":"- Check the installed Tamery version; affected versions are 0.26.1 up to but not including `0.99.0`.\n- Review whether your team runs or relies on Tamery's cloud sync feature.","plain_action":"Update Tamery to version 0.99.0 or later if you have an older version installed.","needs_analyst":false,"not_affected_if":["version-0.99.0-or-later","no-cloud-sync"],"who_is_affected":"Users of Tamery's cloud sync feature on affected versions, where a Pro subscriber account is needed to exploit the flaw. Installations on version 0.99.0 or later, or without cloud sync use, are not exposed according to the description. Whether self-hosted deployments are included is unknown.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000721,"input_tokens":4162,"output_tokens":610,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-119664':15A,18A '-2026':14A,17A '0.26.1':33B,85C '0.99.0':35B,87C 'accept':47B 'ai':10A,20B,23B,79B,130C 'ai-chat':19B 'ai-tool':22B 'anoth':62B,113C 'api':97C 'arbitrari':71B,122C 'authent':2A,57B,108C 'author':38B,90C 'bypass':91C 'chat':11A,21B,65B,80B,116C,131C 'chatid':52B,106C 'chatsmessages.update':44B,98C 'check':54B 'client':50B,104C 'client-suppli':49B,103C 'cloud':26B,42B,95C 'cloud-sync':25B 'conar':31B,84C 'contain':88C 'cve':13A,16A 'flaw':39B 'former':30B,83C 'handler':45B,99C 'histori':12A,81B,132C 'id':66B,117C 'insert':68B 'know':61B,112C 'leav':101C 'messag':6A,69B,120C 'metadata':74B,125C 'move':119C 'ownership':55B 'part':72B,123C 'pro':58B,109C 'subscrib':59B,110C 'suppli':51B,105C 'sync':27B,43B,96C 'tameri':1A,28B,29B,82C 'tool':24B 'user':3A,9A,63B,114C 'version':32B 'victim':77B,128C 'vulner':92C 'without':53B 'writabl':107C 'write':5A","nicknames":[],"mitigations":[],"who_affected":"Users of Tamery's cloud sync feature on affected versions, where a Pro subscriber account is needed to exploit the flaw. Installations on version 0.99.0 or later, or without cloud sync use, are not exposed according to the description. Whether self-hosted deployments are included is unknown.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"everyone","plain_action":"Update Tamery to version 0.99.0 or later if you have an older version installed.","first_public_at":"2026-10-30T15:16:50+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/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-2026-119664","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119664","severity":null,"published_at":"2026-10-30T15:16:50+00:00","modified_at":"2026-10-30T15:16:50+00:00","first_seen_at":"2026-10-30T15:31:11+00:00","fetched_at":"2026-10-30T15:31:11+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"}