CVE-2026-54009 | Open WebUI is a self-hosted artificial intelligence platform… | CVSS 6.5 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.

Metadata

CVE ID: CVE-2026-54009
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-11 16:34 UTC
Published: 2026-06-23 16:49 UTC
Last updated: 2026-06-23 16:49 UTC
Primary CWE: CWE-639
CWE-639: Authorization Bypass Through User-Controlled Key
Vendor / Product: open-webui / open-webui
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products (1)

Vendor	Product	Platform	Versions
open-webui	open-webui	—	< 0.9.6

Weakness (CWE)

CWE	Source	Description
CWE-639	cna	CWE-639: Authorization Bypass Through User-Controlled Key

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References (1)

https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frg https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frg