{"id":"CVE-2026-44558","aliases":["GHSA-7rjh-px4v-5w55","PYSEC-2026-2711"],"url":"https://o3.security/vulnerability/CVE-2026-44558","summary":"Open WebUI: Channel Access Grants Bypass filter_allowed_access_grants","details":"Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the channel router does not call filter_allowed_access_grants on either create or update paths. A non-admin user who can create group channels (or who owns a channel) can submit arbitrary access grants — including public wildcard grants — and those grants are stored verbatim, bypassing the admin's permission framework. This vulnerability is fixed in 0.9.0.","published":"2026-05-15T19:43:40.120Z","modified":"2026-08-07T11:31:06.664845786Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"open-webui","fixedVersion":"0.9.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44558.json"},{"type":"ADVISORY","url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-7rjh-px4v-5w55"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44558"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:06.664845786Z"}}