Medium severity6.5GHSA Advisory· Published May 15, 2026· Updated May 19, 2026
CVE-2026-45339
CVE-2026-45339
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
open-webuPyPI | < 0.9.0 | 0.9.0 |
Affected products
2<= 0.8.12+ 1 more
- (no CPE)range: <= 0.8.12
- cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*range: <0.9.0
Patches
Vulnerability mechanics
References
4- github.com/open-webui/open-webui/security/advisories/GHSA-57q6-fvp4-pqmmnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-57q6-fvp4-pqmmghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-45339ghsaADVISORY
- github.com/open-webui/open-webui/releases/tag/v0.9.0ghsaWEB
News mentions
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