Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-54011

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 17.2%
CVSS Severity
CVSS v3 Score 8.7
Products affected by CVE-2026-54011


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