CVE-2026-44558
Medium
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the channel router does not call filter_allowed_access_grants on either create or update paths. A non-admin user who can create group channels (or who owns a channel) can submit arbitrary access grants — including public wildcard grants — and those grants are stored verbatim, bypassing the admin's permission framework. This vulnerability is fixed in 0.9.0.
SeverityMedium
CVSS5.4
Exploit probability—
ProductOpenwebui Open Webui
PublishedMay 15, 2026
First seenMay 15, 2026
Weakness typeCWE-862Missing authorization
How to fix
Update
- openwebui open_webui0.9.0 or later
- open-webui0.9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openwebui open_webui | v < 0.9.0 | 0.9.0 |
| open-webuiPyPI | v < 0.9.0 | 0.9.0 |
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