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Vulnerability record · CVE-2026-70482 · published 4 August 2026

CVE-2026-70482: Openwebui open webui improper authentication vulnerability

Openwebui · Open Webui

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.

8.8 CVSS 3.1 High EPSS 0.57% · top 55.1% CWE-287 · Improper authentication
8.8CVSS 3.1 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
18 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/open-webui/open-webui/commit/b190dcf3caa00dc8b7b9c7312828298d9143f60d Patch
https://github.com/open-webui/open-webui/commit/c4332be71e6e9c314e8a13b9d2819a6932561630 Patch
https://github.com/open-webui/open-webui/releases/tag/v0.11.0 Release Notes
https://github.com/open-webui/open-webui/security/advisories/GHSA-rq84-p6rr-vf89 ExploitMitigationVendor Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-rq84-p6rr-vf89 ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-70482), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.