CVE-2026-45339
Analyzed Analyzed - Analysis Complete
BaseFortify

Publication date: 2026-05-15

Last updated on: 2026-05-19

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2026-05-15
Last Modified
2026-05-19
Generated
2026-06-10
EPSS Evaluated
2026-06-08
NVD
CVE-2026-45339
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openwebui open_webui to 0.9.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
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