{"id":"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.","aliases":["GHSA-3pf7-q2g3-wj28"],"modified":"2026-09-12T03:31:03.063217522Z","published":"2026-09-09T21:30:09.334Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-639","CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87997.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/open-webui/open-webui","events":[{"introduced":"4d2e13cf2bcc451b33bb6374bea4d2163e6cc94c"},{"fixed":"d9e23b90c100d19b00270aea3cde0501d2354a6c"},{"fixed":"d3e8bf3405e848cfba377814d0aa7ba7290e414d"}],"database_specific":{"extracted_events":[{"introduced":"0.10.0"},{"fixed":"0.11.1"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v0.11.0","v0.10.2","v0.10.1","v0.10.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87997.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}