Path traversal in Open WebUI - #VU136852
Published: July 3, 2026
Vulnerability identifier: #VU136852
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Open WebUI
Affected software:
Open WebUI
Open WebUI
Detailed vulnerability description
The vulnerability allows a remote user to access paths outside the intended terminal proxy path boundary.
The vulnerability exists due to path traversal in _sanitize_proxy_path() in backend/open_webui/routers/terminals.py when processing a 9x percent-encoded traversal path through the terminal proxy. A remote user can send a specially crafted path parameter to access paths outside the intended terminal proxy path boundary.
Exploitation requires access to an existing admin-configured terminal connection, and forwarded requests use the configured terminal credentials and X-User-Id header.
Remediation
Install security update from vendor's website.