CVE-2026-54009
MEDIUM EPSS 13.1%
Published Jun 23, 20261w ago · Modified Jun 24, 20266d ago
6.5 CVSS 3.1
Published Jun 23, 2026 1w ago
Last Modified Jun 24, 2026 6d ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None
Threat Intelligence
EPSS Exploit Probability
13.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-639
References 1
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frg
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.