CVE-2026-28786 Details
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.
A path traversal vulnerability has been identified in Open WebUI versions prior to 0.8.6. An unsanitized filename field in the speech-to-text transcription endpoint allows authenticated non-admin users to trigger a FileNotFoundError. The error message returned in the HTTP 400 response body includes the server's absolute DATA_DIR path, leading to unauthorized information disclosure on default deployments. The vulnerability arises because the filename is not properly sanitized before being used to construct a file path, allowing for traversal sequences to be exploited.
Users are advised to update to Open WebUI version 0.8.6 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 27, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/open-webui/open-webui/security/advisories/GHSA-vvxm-vxmr-624h | CISA-ADP | ExploitVendor Advisory |
| https://github.com/open-webui/open-webui/security/advisories/GHSA-vvxm-vxmr-624h | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-209 | Generation of Error Message Containing Sensitive Information | [email protected] |
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| openwebui open webui | < 0.8.6 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 30, 2026 | Initial Analysis | [email protected] |
| Mar 27, 2026 | CVE Modified | CISA-ADP |
| Mar 27, 2026 | New CVE Received | [email protected] |