Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI allows admins to restrict which API endpoints an API key can access. When an API key is restricted from /api/v1/messages, requests using the Authorization: Bearer sk-... header are correctly blocked with 403. However, the same key sent via the x-api-key header bypasses the restriction entirely — the request is authenticated, the model is invoked, and a full response is returned. This vulnerability is fixed in 0.9.0.
Metrics
Affected Vendors & Products
References
History
Tue, 19 May 2026 03:15:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Openwebui
Openwebui open Webui |
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| CPEs | cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Openwebui
Openwebui open Webui |
Mon, 18 May 2026 16:30:00 +0000
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| Metrics |
ssvc
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Fri, 15 May 2026 21:00:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Open-webui
Open-webui open-webui |
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| Vendors & Products |
Open-webui
Open-webui open-webui |
Fri, 15 May 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
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| Description | Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI allows admins to restrict which API endpoints an API key can access. When an API key is restricted from /api/v1/messages, requests using the Authorization: Bearer sk-... header are correctly blocked with 403. However, the same key sent via the x-api-key header bypasses the restriction entirely — the request is authenticated, the model is invoked, and a full response is returned. This vulnerability is fixed in 0.9.0. | |
| Title | Open WebUI: API key endpoint restrictions bypassed via `x-api-key` header — full message processing on restricted endpoints | |
| Weaknesses | CWE-863 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-05-15T19:21:26.401Z
Updated: 2026-05-19T03:55:42.745Z
Reserved: 2026-05-11T21:40:08.176Z
Link: CVE-2026-45339
Updated: 2026-05-18T14:30:21.256Z
Status : Analyzed
Published: 2026-05-15T20:16:48.693
Modified: 2026-05-19T03:07:48.750
Link: CVE-2026-45339
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