CVE-2026-87995: Openwebui Open Webui

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.11 until 0.11.1, src/lib/components/chat/FileNav/PortPreview.svelte rendered terminal port content in an iframe sandbox containing both allow-scripts and allow-same-origin. Because the terminal proxy serves that content from the Open WebUI origin, an authenticated user with access to a shared terminal server could host script on a previewed port and take over a victim's account when the victim opened the preview. This issue is fixed in version 0.11.1.

Affected products

• Openwebui Open Webui: from 0.8.11, before 0.11.1 (fixed in 0.11.1)

Published 2026-09-09. Last modified 2026-09-16.