Security Advisory

CVE-2026-54011

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-23 16:47:43

Last updated 2026-06-23 17:55:33

Assigner GitHub_M

CVSS score 8.7

State PUBLISHED

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6,Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working payload was validated through the Markdown preview path, resulting in JavaScript execution in the victim’s browser under the application origin. This vulnerability is fixed in 0.9.6.

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