CVE-2026-28786CWE-209CWE-22

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

Medium · published March 26, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
35.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00421 · 35.4th percentile
Weaknesses
CWE-209 · Generation of Error Message Containing Sensitive Information; CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-03-26T23:37Z
EPSS history
Timeline
  • 26 MAR 23:37Z
    Open WebUI vulnerable to Path Traversal in `POST /api/v1/audio/transcriptions`
    cvelistv5