{"cve":"CVE-2026-45339","nvd":{"published":"2026-05-15T20:16:48.693","modified":"2026-06-17T10:51:56.130","status":"Analyzed","description":"Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI allows admins to restrict which API endpoints an API key can access. When an API key is restricted from /api/v1/messages, requests using the Authorization: Bearer sk-... header are correctly blocked with 403. However, the same key sent via the x-api-key header bypasses the restriction entirely — the request is authenticated, the model is invoked, and a full response is returned. This vulnerability is fixed in 0.9.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","score":6.5},"cwes":["CWE-863"],"references":["https://github.com/open-webui/open-webui/security/advisories/GHSA-57q6-fvp4-pqmm","https://github.com/open-webui/open-webui/security/advisories/GHSA-57q6-fvp4-pqmm"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-45339","score":0.00309,"percentile":0.23724,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-57q6-fvp4-pqmm","url":"https://osv.dev/vulnerability/GHSA-57q6-fvp4-pqmm","summary":"Open WebUI's API key endpoint restrictions bypassed via `x-api-key` header — full message processing on restricted endpoints","modified":"2026-07-23T17:11:29.480263954Z","packages":[{"ecosystem":"PyPI","name":"open-webu","purl":"pkg:pypi/open-webu","ranges":["<0.9.0"],"fixed":["0.9.0"]}]},{"id":"PYSEC-2026-3543","url":"https://osv.dev/vulnerability/PYSEC-2026-3543","summary":"Open WebUI's API key endpoint restrictions bypassed via `x-api-key` header — full message processing on restricted endpoints","modified":"2026-07-23T17:00:11.717513592Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.0"],"fixed":["0.9.0"]}]}],"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."]}