Open WebUI Allows Arbitrary File Write via the `/models/upload` Endpoint

In open-webui version 0.3.8, the endpoint /models/upload is vulnerable to arbitrary file write due to improper handling of user-supplied filenames. The vulnerability arises from the usage of filepath = f"UPLOADDIR/file.filename" without proper input validation or sanitization. An attacker can...

PYSEC-2026-1730 Open WebUI Allows Arbitrary File Write via the `/models/upload` Endpoint

In open-webui version 0.3.8, the endpoint /models/upload is vulnerable to arbitrary file write due to improper handling of user-supplied filenames. The vulnerability arises from the usage of filepath = f"UPLOADDIR/file.filename" without proper input validation or sanitization. An attacker can...

Directory Traversal

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Directory Traversal through the /models/upload endpoint. An attacker can manipulate the file.filename parameter to include directory traversal sequences, causing the resulting filepath to escape the intended...

PT-2025-12292

Name of the Vulnerable Software and Affected Versions open-webui/open-webui version 0.3.21 Description A Denial of Service DoS issue exists, affecting multiple endpoints, including "/ollama/models/upload", "/audio/api/v1/transcriptions", and "/rag/api/v1/doc". The application processes multipart...

Open WebUI path traversal vulnerability

Open WebUI is an extensible, feature-rich, user-friendly self-hosted WebUI from Open WebUI open source. A path traversal vulnerability exists in Open WebUI version 0.3.8, which stems from improper handling of filenames in the /models/upload endpoint, which could lead to arbitrary file writes...

PT-2025-12174

Name of the Vulnerable Software and Affected Versions open-webui version 0.3.8 Description The issue arises from the improper handling of user-supplied filenames in the /models/upload endpoint, specifically due to the usage of file path = f"UPLOAD DIR/file.filename" without proper input validatio...