{"cve":"CVE-2026-54021","nvd":{"published":"2026-06-23T18:18:07.370","modified":"2026-06-26T20:17:26.070","status":"Analyzed","description":"Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, several direct, index-addressed Ollama proxy routes accept a caller-supplied url_idx path parameter and use it as a raw index into the admin-configured OLLAMA_BASE_URLS list. Access control on these routes validates only whether the user may use the requested model, never which backend the request is routed to. Any authenticated user can append an arbitrary url_idx to force their request onto an Ollama backend they were never authorized to reach, including internal, higher-privilege, or explicitly admin-disabled backends. This vulnerability is fixed in 0.9.6.","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:L/A:L","score":6.3},"cwes":["CWE-863"],"references":["https://github.com/open-webui/open-webui/security/advisories/GHSA-9rpj-v7hf-vv2w"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:41:17.107060303+00:00"},"epss":{"cve":"CVE-2026-54021","score":0.00283,"percentile":0.20858,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-9rpj-v7hf-vv2w","url":"https://osv.dev/vulnerability/GHSA-9rpj-v7hf-vv2w","summary":"Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter","modified":"2026-07-20T21:15:26.037031096Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.6"],"fixed":["0.9.6"]}]},{"id":"PYSEC-2026-2718","url":"https://osv.dev/vulnerability/PYSEC-2026-2718","summary":"Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter","modified":"2026-07-13T16:32:18.829322998Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.6"],"fixed":["0.9.6"]}]}],"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."]}