What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-27 · updated 2026-06-17
• Weakness: CWE-22

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.

Affected products

• open-webui: before 0.8.6 — fixed in 0.8.6

How to fix

Upgrade to a fixed version: open-webui 0.8.6. Check the vendor advisory for mitigations.

References

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

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