Medium severity · published Sep 10, 2026
CVE-2026-88005
Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open-webui · open-webui
>= 0.8.0, < 0.9.0 · source: vendor
OW
Open Webui · Openwebui
0.8.0 before 0.9.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-88005
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-88005
Patch
https://github.com/open-webui/open-webui/commit/fb5ef978bfb451c3f2221931e08e54250cec58ca
Patch
https://github.com/open-webui/open-webui/pull/23639
Patch
https://github.com/open-webui/open-webui/security/advisories/GHSA-4qg5-cxx4-g927
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