Vulnerability · Published Mar 26, 2026 · Assigned by GitHub_M

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

Medium 4.3

In plain English

A medium-severity path traversal in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.6%top 52.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.8.6	GHSA-vvxm-vxmr-624h
PyPI	open-webui	0.8.6	PYSEC-2026-2764

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.8.6

Weakness: CWE-22, CWE-209 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

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