CVE-2026-88005: Open WebUI OAuth email domain allowlist bypass vulnerability

# CVE-2026-88005: Open WebUI OAuth email domain allowlist bypass vulnerability

https://gcdradar.vercel.app/incidents/cve-2026-88005-open-webui-oauth-email-domain-allowlist-bypas · AIR-2026-0105 · closed 2026-09-10

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-09-10
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-88005
- CVSS: 6.5

## Summary

Open WebUI's OAuth token exchange endpoint issues working sessions without applying the standard email domain allowlist enforcement. Accounts with unauthorized email domains can successfully obtain valid sessions.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-09-10: CVE-2026-88005: Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange (https://github.com/advisories/GHSA-4qg5-cxx4-g927)
- 2026-09-10: CVE-2026-88005: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. (https://nvd.nist.gov/vuln/detail/CVE-2026-88005)

## Sources

- 2026-09-10 NVD: CVE-2026-88005: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. https://nvd.nist.gov/vuln/detail/CVE-2026-88005
- 2026-09-10 GitHub Advisory Database: CVE-2026-88005: Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange https://github.com/advisories/GHSA-4qg5-cxx4-g927

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.