CVE-2026-54009

Medium

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, POST /api/chat/completions accepts an image_url.url value that, when it does NOT start with http://, https://, or data:image/, is interpreted as a file id and resolved against the global file table with no ownership check. an authenticated user can therefore set image_url.url to another user's file id, the server reads that file from disk, base64-encodes it, and injects the data URI into the LLM request. the user then prompts the LLM to describe / OCR the file and reads the content back. This vulnerability is fixed in 0.9.6.

SeverityMedium

CVSS6.5

Exploit probability—

ProductOpenwebui Open Webui

PublishedJun 23, 2026

First seenJun 23, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

openwebui open_webui0.9.6 or later
open-webui0.9.6 or later

Affected products

Product	Affected versions	Fixed in
openwebui open_webui	v < 0.9.6	0.9.6
open-webuiPyPI	v < 0.9.6	0.9.6

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