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VULNERABILITIES

CVE-2026-45339 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/open-webui/open-webui/security/advisories/GHSA-57q6-fvp4-pqmm CISA-ADPExploitVendor Advisory
https://github.com/open-webui/open-webui/security/advisories/GHSA-57q6-fvp4-pqmm [email protected]ExploitVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-863Incorrect Authorization[email protected]

Affected Products

ProductVersions
openwebui open webui
< 0.9.0

CPE

  • cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-45339
NVD Published Date:
May 15, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-45339 Details - Not Deferred