{"cve":"CVE-2026-70482","nvd":{"published":"2026-08-04T20:16:55.190","modified":"2026-09-18T14:46:15.200","status":"Analyzed","description":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLE_OAUTH_TOKEN_EXCHANGE=True, /oauth/{provider}/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which OAuth client the token was issued to. Anyone holding an access token minted for any client registered with the same provider could exchange it for an Open WebUI session as that token user, including applications the operator does not control and has never authorized. This issue is fixed in 0.11.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-287"],"references":["https://github.com/open-webui/open-webui/commit/b190dcf3caa00dc8b7b9c7312828298d9143f60d","https://github.com/open-webui/open-webui/commit/c4332be71e6e9c314e8a13b9d2819a6932561630","https://github.com/open-webui/open-webui/releases/tag/v0.11.0","https://github.com/open-webui/open-webui/security/advisories/GHSA-rq84-p6rr-vf89","https://github.com/open-webui/open-webui/security/advisories/GHSA-rq84-p6rr-vf89"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:47:10.050265369+00:00"},"epss":{"cve":"CVE-2026-70482","score":0.00569,"percentile":0.47151,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-rq84-p6rr-vf89","url":"https://osv.dev/vulnerability/GHSA-rq84-p6rr-vf89","summary":"Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client","modified":"2026-08-10T11:40:51.017416443Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.8.0 <0.11.0"],"fixed":["0.11.0"]}]},{"id":"PYSEC-2026-3652","url":"https://osv.dev/vulnerability/PYSEC-2026-3652","summary":"Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client","modified":"2026-08-10T11:30:11.672017608Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.8.0 <0.11.0"],"fixed":["0.11.0"]}]}],"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."]}