CVE-2026-28786
MEDIUMOpen WebUI vulnerable to Path Traversal in `POST /api/v1/audio/transcriptions`
Title source: cnaDescription
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 v3
4.3
EPSS
0.0003
EPSS Percentile
7.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-209
CWE-22
Status
published
Products (3)
open-webui/open-webui
< 0.8.6
openwebui/open_webui
< 0.8.6
pypi/open-webui
0 - 0.8.6PyPI
Published
Mar 27, 2026
Tracked Since
Mar 27, 2026