Vulnerability Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, an unsanitized filename field in the speech-to-text transcription endpoint allows any authenticated non-admin user to trigger a `FileNotFoundError` whose message — including the server's absolute `DATA_DIR` path — is returned verbatim in the HTTP 400 response body, confirming information disclosure on all default deployments. Version 0.8.6 patches the issue.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openwebui | Open Webui | < 0.8.6 |
Related Weaknesses (CWE)
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-vvxm-vxmr-624hExploitVendor Advisory
- https://github.com/open-webui/open-webui/security/advisories/GHSA-vvxm-vxmr-624hExploitVendor Advisory
FAQ
What is CVE-2026-28786?
CVE-2026-28786 is a vulnerability with a CVSS score of 4.3 (MEDIUM). Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, an unsanitized filename field in the speech-to-text transcription endpoint al...
How severe is CVE-2026-28786?
CVE-2026-28786 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-28786?
Check the references section above for vendor advisories and patch information. Affected products include: Openwebui Open Webui.