CVE-2026-54009
Last modified
CVE-2026-54009 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openwebui | Open Webui | < 0.9.6 |
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frgExploit, Vendor Advisory, Mitigation
- https://github.com/open-webui/open-webui/security/advisories/GHSA-wch8-mhj5-9frgExploit, Vendor Advisory, Mitigation
Timeline
- Published
- Last Modified
- Status
- Analyzed
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