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.
Severity (CVSS)
| Base score | 6.5 |
|---|---|
| Severity | Medium |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| Provided by | CNA |
Weaknesses
- CWE-639 — CWE-639: Authorization Bypass Through User-Controlled Key
Affected products
| Vendor | Product | Versions |
|---|---|---|
| open-webui | open-webui | < 0.9.6 |
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frg (x_refsource_CONFIRM)
Generated from the official CVE List on 24 Jun 2026 09:35 UTC.