CVE-2026-88005 json
Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange
published 2026-09-10 59 d ago modified 2026-10-01 38 d ago also GHSA-4qg5-cxx4-g927 , PYSEC-2026-4119 , EUVD-2026-75540
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 31%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi open-webui 0.9.0
- openwebui open_webui 0.9.0
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 54 d ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | >=0.8.0, <0.9.0 |
0.9.0 |
Affected products
- open-webui open-webui
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/open-webui/open-webui/pull/23639
web, patch
-
github.com
/open-webui/open-webui/commit/fb5ef978bfb451c3f2221931e08e54250cec58ca
web, patch
-
github.com
/open-webui/open-webui/security/advisories/GHSA-4qg5-cxx4-g927
web, patch, vendor-advisory
-
github.com
/open-webui/open-webui
package
-
github.com
/open-webui/open-webui/releases/tag/v0.9.0
web
-
pypi.org
/project/open-webui
package
-
github.com
/advisories/GHSA-4qg5-cxx4-g927
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-88005
advisory
Sources
- CVE List CVE-2026-88005
- GitHub Advisory GHSA-4qg5-cxx4-g927
- NVD CVE-2026-88005
- OSV PYSEC-2026-4119
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