CVE-2026-59221: Openwebui Open Webui

High severity, CVSS 7.7. EPSS: 0.5% chance of exploitation in the next 30 days.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 before 0.10.0, _sanitize_proxy_path in backend/open_webui/routers/terminals.py decoded proxy paths only eight times, allowing a nine-times percent-encoded ../ traversal value to pass normalization checks and be decoded by the upstream terminal server. This issue is fixed in version 0.10.0.

Affected products

• Openwebui Open Webui: version 0.9.6 only

Published 2026-07-09. Last modified 2026-07-10.