{"id":"CVE-2026-121937","kind":"vulnerability","aliases":["CVE-2026-121937"],"related":[],"title":"loonflow: any logged-in user can read other users' ticket history","description":"loonflow before r3.2.3 contains a missing authorization vulnerability in TicketFlowHistoryView that allows any authenticated user to read other users' ticket flow history by supplying a ticket UUID. Attackers can request the ticket_flow_history endpoint, which skips ticket_view_permission_check, to obtain approval comments and processor names, emails and phone numbers.","summary":"Loonflow, a ticket workflow system, skips its ticket permission check on the ticket flow history endpoint. Any authenticated user who knows a ticket UUID can read approval comments and processor names, emails and phone numbers.","severity":"low","cvss":3.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["loonflow","package","self-hosted","ticketing"],"not_affected_if":["single-user-deployment","version-r3.2.3-or-later"],"how_to_check":"- Check the installed Loonflow version; affected builds are before `r3.2.3`.\n- Look for the `ticket_flow_history` endpoint in your deployment and confirm whether it is reachable by ordinary logged-in users.","fix":"- Upgrade Loonflow to `r3.2.3` or later.","status":"open","published_at":"2026-11-04T13:17:27+00:00","first_seen_at":"2026-11-04T13:27:01+00:00","triaged_at":"2026-11-04T13:28:13+00:00","updated_at":"2026-11-04T13:28:13+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-04T13:28:13Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Loonflow to `r3.2.3` or later.","reach":"network","title":"loonflow: any logged-in user can read other users' ticket history","impact":"low","summary":"Loonflow, a ticket workflow system, skips its ticket permission check on the ticket flow history endpoint. Any authenticated user who knows a ticket UUID can read approval comments and processor names, emails and phone numbers.","audience":"businesses","category":"package","nicknames":[],"who_cares":["loonflow","self-hosted","ticketing"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"logged-in users read other users' contact details and approval comments","analyst_note":"","how_to_check":"- Check the installed Loonflow version; affected builds are before `r3.2.3`.\n- Look for the `ticket_flow_history` endpoint in your deployment and confirm whether it is reachable by ordinary logged-in users.","plain_action":"","needs_analyst":false,"not_affected_if":["version-r3.2.3-or-later","single-user-deployment"],"who_is_affected":"Teams that run Loonflow for internal ticketing or approvals with more than one class of logged-in user. The flaw needs an account and a ticket UUID, so single-user or fully trusted deployments carry little exposure. unknown for other configurations.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"low"},"cost_usd":0.000671,"input_tokens":4188,"output_tokens":505,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-121937':15A,18A '-2026':14A,17A 'allow':71C 'approv':51B,103C 'attack':87C 'authent':42B,73C 'author':66C 'check':34B,100C 'comment':52B,104C 'contain':63C 'cve':13A,16A 'email':56B,108C 'endpoint':40B,94C 'flow':38B,80C,92C 'histori':12A,39B,81C,93C 'host':23B 'know':45B 'log':4A 'logged-in':3A 'loonflow':1A,19B,25B,60C 'miss':65C 'name':55B,107C 'number':59B,111C 'obtain':102C 'packag':20B 'permiss':33B,99C 'phone':58B,110C 'processor':54B,106C 'r3.2.3':62C 'read':8A,50B,76C 'request':89C 'self':22B 'self-host':21B 'skip':30B,96C 'suppli':83C 'system':29B 'ticket':11A,24B,27B,32B,37B,47B,79C,85C,91C,97C 'ticketflowhistoryview':69C 'user':6A,10A,43B,74C,78C 'uuid':48B,86C 'view':98C 'vulner':67C 'workflow':28B","nicknames":[],"mitigations":[],"who_affected":"Teams that run Loonflow for internal ticketing or approvals with more than one class of logged-in user. The flaw needs an account and a ticket UUID, so single-user or fully trusted deployments carry little exposure. unknown for other configurations.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["loonflow","low","package","selfhosted","ticketing"],"campaign_type":null,"first_public_at":"2026-11-04T13:17:27+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/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-2026-121937","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121937","severity":null,"published_at":"2026-11-04T13:17:27+00:00","modified_at":"2026-11-04T13:17:27+00:00","first_seen_at":"2026-11-04T13:27:01+00:00","fetched_at":"2026-11-04T13:27:01+00:00","note":null}],"documents":[{"id":67072,"url":"https://github.com/blackholll/loonflow/commit/a6495b0c2ca9e5dede8e49217a0468bcfa946de4","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":67073,"url":"https://www.vulncheck.com/advisories/loonflow-before-r3-2.3-idor-via-ticket-flow-history-endpoint","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}