CVE-2026-109285

Medium

Description

Open WebUI from 0.6.0 before 0.11.4 contains an improper access control vulnerability in has_access_to_file that lets former knowledge base collaborators keep file access via stale cached knowledge base references. Attackers with read or write grants can download removed files through the file content endpoint or delete them, including from the owner's private knowledge bases.

SeverityMedium

CVSS5.0

Exploit probability—

ProductOpen-webui

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-863Incorrect authorization

How to fix

Update

open-webui open-webui0.11.4 or later

Vendor advisories

github.com/open-webui/open-webui/security/advisories/GHSA-9cxp-636w-4997

Affected products

Product	Affected versions	Fixed in
open-webui open-webui	0.6.0 ≤ v < 0.11.4	0.11.4

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