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

March 27, 2026

An unsanitised 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.

References

github.com/advisories/GHSA-vvxm-vxmr-624h
github.com/open-webui/open-webui
github.com/open-webui/open-webui/commit/387225eb8b3906909436004f84fff1b012e067d4
github.com/open-webui/open-webui/security/advisories/GHSA-vvxm-vxmr-624h
nvd.nist.gov/vuln/detail/CVE-2026-28786

Code Behaviors & Features

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