What’s Vulnerable › Vulnerabilities

CVE-2026-88005: Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-10 · updated 2026-09-18
• Weakness: CWE-863

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.9.0, Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without applying the email domain allowlist that the normal OAuth login callback enforces. An account whose email domain the login callback would refuse could still obtain a working session through this endpoint. This issue is fixed in version 0.9.0.

Affected products

• open-webui: from 0.8.0 before 0.9.0 — fixed in 0.9.0

How to fix

Upgrade to a fixed version: open-webui 0.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/open-webui/open-webui/commit/fb5ef978bfb451c3f2221931e08e54250cec58ca
• https://github.com/open-webui/open-webui/pull/23639
• https://github.com/open-webui/open-webui/security/advisories/GHSA-4qg5-cxx4-g927

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