CVE-2026-87995

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.

• CWE-79
• CWE-1021

• https://github.com/open-webui/open-webui/commit/54d7a223707f03172efbb9e754db6e69709956d0Patch
• https://github.com/open-webui/open-webui/releases/tag/v0.11.1Release Notes
• https://github.com/open-webui/open-webui/security/advisories/GHSA-jmc6-2wr8-h3wjExploit, Vendor Advisory
• https://github.com/open-webui/open-webui/security/advisories/GHSA-jmc6-2wr8-h3wjExploit, Vendor Advisory

Published

Sep 9, 2026

Last Modified

Sep 16, 2026

Status

Analyzed

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