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CVE-2026-28786— Open WebUI vulnerable to Path Traversal in `POST /api/v1/audio/transcriptions`

Quick assessment

Affected
open-webui open-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open WebUI是Open WebUI开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.8.6之前版本存在安全漏洞，该漏洞源于语音转文字端点中未清理的文件名字段，可能导致信息泄露。

CVSS 4.3 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2026-28786

Vulnerability Information
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Vulnerability Title
Open WebUI vulnerable to Path Traversal in `POST /api/v1/audio/transcriptions`
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Open WebUI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.8.6之前版本存在安全漏洞，该漏洞源于语音转文字端点中未清理的文件名字段，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-webui open-webui < 0.8.6 -

II. Public POCs for CVE-2026-28786

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III. Intelligence Information for CVE-2026-28786

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Vendor Advisories for CVE-2026-28786 (1)

Same Patch Batch · open-webui · 2026-03-26 · 4 CVEs total

CVE-2026-28788 7.1 HIGH Open WebUI's process_files_batch() endpoint missing ownership check, allows unauthorized f
CVE-2026-29070 5.4 MEDIUM Open WebUI has unauthorized deletion of knowledge files
CVE-2026-29071 3.1 LOW Open WebUI's Insecure Direct Object Reference (IDOR) allows access to other users' memorie

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-22

V. Comments for CVE-2026-28786

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