{"cve":"CVE-2026-87997","nvd":{"published":"2026-09-09T22:18:48.267","modified":"2026-09-16T15:14:39.770","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3},"cwes":["CWE-639","CWE-862"],"references":["https://github.com/open-webui/open-webui/commit/d9e23b90c100d19b00270aea3cde0501d2354a6c","https://github.com/open-webui/open-webui/pull/28366","https://github.com/open-webui/open-webui/releases/tag/v0.11.1","https://github.com/open-webui/open-webui/security/advisories/GHSA-3pf7-q2g3-wj28","https://github.com/open-webui/open-webui/security/advisories/GHSA-3pf7-q2g3-wj28"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:52:53.108888569+00:00"},"epss":{"cve":"CVE-2026-87997","score":0.00372,"percentile":0.31133,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3pf7-q2g3-wj28","url":"https://osv.dev/vulnerability/GHSA-3pf7-q2g3-wj28","summary":"Open WebUI: Any authenticated user can inject chats into another user's folder via chat completions","modified":"2026-10-01T17:56:19.989601073Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.10.0 <0.11.1"],"fixed":["0.11.1"]}]},{"id":"PYSEC-2026-4118","url":"https://osv.dev/vulnerability/PYSEC-2026-4118","summary":"Open WebUI: Any authenticated user can inject chats into another user's folder via chat completions","modified":"2026-10-01T17:45:11.685977207Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.10.0 <0.11.1"],"fixed":["0.11.1"]}]}],"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."]}