CVE-2026-28786

Open WebUI vulnerable to Path Traversal in `POST /api/v1/audio/transcriptions`

State: Published
Severity: 4.3 Medium
Published: Mar 26, 2026
Updated: Mar 27, 2026
Reserved: Mar 3, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-209 Generation of Error Message Containing Sensitive Information

Affected Products

Product	Versions
open-webuiopen-webui	< 0.8.6Affected

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-vvxm-vxmr-624h

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