What’s Vulnerable › Vulnerabilities

CVE-2026-70482: Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-04 · updated 2026-09-18
• Weakness: CWE-287

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.

Affected products

• open-webui: from 0.8.0 before 0.11.0 — fixed in 0.11.0

How to fix

Upgrade to a fixed version: open-webui 0.11.0. Check the vendor advisory for mitigations.

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

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