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CVE-2026-45339

MEDIUM · CVSS 6.5 EPSS 0.03% Public Exploit

Source: NVD + CISA KEV + EPSS · Published: 2026-05-15 · Last synced: 2026-06-09

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Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

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CVE
CVE-2026-45339
Severity
MEDIUM
CVSS
6.5
EPSS
0.03%

Original NVD 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.