{"id":"CVE-2026-111670","kind":"vulnerability","aliases":["CVE-2026-111670"],"related":[],"title":"ClickVisual: low-privilege users can read ClickHouse schemas they were not granted","description":"ClickVisual through 1.1.2 contains a missing authorization vulnerability in the /api/v2/reports handlers that allows authenticated low-privileged users to access ClickHouse instances they were not granted. Attackers can iterate the instance-id parameter in ReportSourceDatabases, ReportSourceTables, ReportTableColumns and WhereCheckRun to enumerate schemas and infer row counts of restricted tables.","summary":"ClickVisual through 1.1.2 has a missing authorization check in its /api/v2/reports handlers. An authenticated low-privileged user can change the instance-id parameter to enumerate schemas and infer row counts of ClickHouse tables they were never granted.","severity":"medium","cvss":5.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["clickhouse","clickvisual","other","self-hosted"],"not_affected_if":["auth-required","single-user-deployment"],"how_to_check":"- Check the ClickVisual version with the deployed binary or image tag; versions up to `1.1.2` are listed as affected\n- Review which users hold low-privilege roles and whether they have access to ClickHouse instances they should not see","fix":null,"status":"open","published_at":"2026-10-16T18:17:49+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","triaged_at":"2026-10-25T04:27:08+00:00","updated_at":"2026-10-25T04:27:08+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-25T04:27:08Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"ClickVisual: low-privilege users can read ClickHouse schemas they were not granted","impact":"medium","summary":"ClickVisual through 1.1.2 has a missing authorization check in its /api/v2/reports handlers. An authenticated low-privileged user can change the instance-id parameter to enumerate schemas and infer row counts of ClickHouse tables they were never granted.","category":"other","nicknames":[],"who_cares":["clickvisual","clickhouse","self-hosted"],"confidence":0.6,"needs_auth":"yes","worst_case":"Attacker reads schemas and infers row counts of restricted ClickHouse tables","analyst_note":"Check the NVD entry and the ClickVisual repository for a fixed release and patch commit; the sources give no fixed version or workaround.","how_to_check":"- Check the ClickVisual version with the deployed binary or image tag; versions up to `1.1.2` are listed as affected\n- Review which users hold low-privilege roles and whether they have access to ClickHouse instances they should not see","needs_analyst":true,"not_affected_if":["single-user-deployment","auth-required"],"who_is_affected":"Teams running ClickVisual 1.1.2 or earlier that have more than one user with a low-privilege role. Exposure depends on whether those users are supposed to be limited to specific ClickHouse instances. Single-user installs or deployments where every account can see all instances are less exposed.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000609,"input_tokens":3368,"output_tokens":544,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-111670':16A,19A '-2026':15A,18A '/api/v2/reports':36B,75C '1.1.2':28B,67C 'access':85C 'allow':78C 'attack':92C 'authent':39B,79C 'author':32B,71C 'chang':45B 'check':33B 'clickhous':8A,20B,59B,86C 'clickvisu':1A,21B,26B,65C 'contain':68C 'count':57B,112C 'cve':14A,17A 'enumer':52B,107C 'grant':13A,64B,91C 'handler':37B,76C 'host':25B 'id':49B,98C 'infer':55B,110C 'instanc':48B,87C,97C 'instance-id':47B,96C 'iter':94C 'low':3A,41B,81C 'low-privileg':2A,40B,80C 'miss':31B,70C 'never':63B 'paramet':50B,99C 'privileg':4A,42B,82C 'read':7A 'reportsourcedatabas':101C 'reportsourcet':102C 'reporttablecolumn':103C 'restrict':114C 'row':56B,111C 'schema':9A,53B,108C 'self':24B 'self-host':23B 'tabl':60B,115C 'user':5A,43B,83C 'vulner':72C 'wherecheckrun':105C","nicknames":[],"mitigations":[],"who_affected":"Teams running ClickVisual 1.1.2 or earlier that have more than one user with a low-privilege role. Exposure depends on whether those users are supposed to be limited to specific ClickHouse instances. Single-user installs or deployments where every account can see all instances are less exposed.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T18:17:49+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/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-2026-111670","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111670","severity":null,"published_at":"2026-10-16T18:17:49+00:00","modified_at":"2026-10-19T14:16:59+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"}