CVE-2026-88005 Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange
Attackers with valid provider tokens can bypass OAuth domain allowlists to gain unauthorized access to Open WebUI accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-88005?
CVE-2026-88005 is a medium-severity authentication bypass vulnerability in Openwebui Open Webui, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-88005?
3 open source packages ship an affected version, including open-webui. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
open-webui PyPI | From 0.8.0 | 0.9.0 |
open-webui PyPI | From 0.8.0 | 0.9.0 |
open-webui PyPI | From 0.8.0 | 0.9.0 |
Products include Openwebui Open Webui.
How do I fix CVE-2026-88005?
Upgrade open-webui to 0.9.0 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-88005 being exploited?
There is no known exploitation of CVE-2026-88005 in the wild and no public exploit code.
Other vulnerabilities in Openwebui Open Webui
- CVE-2026-44551 Open WebUI: LDAP Empty Password Authentication Bypass
- CVE-2026-56400 open-webui - Remote Code Execution via CORS Misconfiguration and Session Validation
- CVE-2024-8017 Cross-site Scripting (XSS) in open-webui/open-webui
- CVE-2026-45672 Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed
- CVE-2026-87995 Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
Sources
Also known as GHSA-4qg5-cxx4-g927, PYSEC-2026-4119.