CVE-2026-70487

Medium

Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.8 until 0.11.0, inline direct model metadata accepted client-supplied knowledge attachments without filtering them against the caller's read access. Any authenticated user who knew another user's file id could have the builtin knowledge tools return indexed chunks from that file, causing a read-only cross-user confidentiality loss while leaving knowledge-base permissions and saved workspace model validation unaffected. This issue is fixed in 0.11.0.

SeverityMedium

CVSS5.3

Exploit probability—

ProductOpenwebui Open Webui

PublishedAug 4, 2026

First seenAug 4, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

openwebui open_webui0.11.0 or later
open-webui0.11.0 or later

Affected products

Product	Affected versions	Fixed in
openwebui open_webui	0.8.8 ≤ v < 0.11.0	0.11.0
open-webuiPyPI	0.8.8 ≤ v < 0.11.0	0.11.0

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