{"id":"CVE-2026-87997","aliases":["GHSA-3pf7-q2g3-wj28"],"url":"https://o3.security/vulnerability/CVE-2026-87997","summary":"Open WebUI: Any authenticated user can inject chats into another user's folder via chat completions","details":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, POST /api/chat/completions and POST /api/v1/chat/completions in backend/open_webui/main.py copied a client-supplied folder_id into a new chat without applying the folder write-access check used by the dedicated chat routes. An authenticated user who knew a shared folder identifier could inject an attacker-controlled chat into a folder where the user had read-only or no write access, causing the entry to appear to authorized folder readers. This issue is fixed in version 0.11.1.","published":"2026-09-09T21:30:09.334Z","modified":"2026-09-11T03:48:43.863460954Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"open-webui","fixedVersion":"0.11.1"}],"fix":{"url":"https://github.com/open-webui/open-webui/commit/d9e23b90c100d19b00270aea3cde0501d2354a6c","label":"open-webui/open-webui@d9e23b9"},"references":[{"type":"WEB","url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87997.json"},{"type":"ADVISORY","url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3pf7-q2g3-wj28"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-87997"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/commit/d9e23b90c100d19b00270aea3cde0501d2354a6c"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/pull/28366"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-11T03:48:43.863460954Z"}}