{"cve":"CVE-2026-44559","nvd":{"published":"2026-05-15T20:16:47.483","modified":"2026-06-17T10:50:47.533","status":"Analyzed","description":"Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the GET /api/v1/channels/{id}/members endpoint only checks membership for group and dm channel types (lines 467-469). For standard channels — including private ones — there is no channel_has_access check before returning the member list. Any authenticated user who knows a private channel's UUID can enumerate all users with access to that channel. This vulnerability is fixed in 0.9.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3},"cwes":["CWE-862"],"references":["https://github.com/open-webui/open-webui/security/advisories/GHSA-c7wp-3qh5-55pv","https://github.com/open-webui/open-webui/security/advisories/GHSA-c7wp-3qh5-55pv"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-44559","score":0.00221,"percentile":0.1268,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-c7wp-3qh5-55pv","url":"https://osv.dev/vulnerability/GHSA-c7wp-3qh5-55pv","summary":"Open WebUI Missing Access Check on Channel Members Endpoint for Standard Channels","modified":"2026-07-13T16:42:49.255236545Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.0"],"fixed":["0.9.0"]}]},{"id":"PYSEC-2026-2720","url":"https://osv.dev/vulnerability/PYSEC-2026-2720","summary":"Open WebUI Missing Access Check on Channel Members Endpoint for Standard Channels","modified":"2026-07-13T16:32:19.857821477Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.0"],"fixed":["0.9.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}