Open WebUI: Stored XSS in Mermaid Markdown Preview

SummaryOpen 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...

Cross-site Scripting (XSS)

Overview @oneuptime/common is a The OneUptime Common UI Library is a collection of shared components, utilities that are used across the OneUptime platform. It is designed to be easy to install and use, and to be extensible. This library is built with React and TypeScript. It includes c Affected...

CVE-2026-21866

Dify is an open-source LLM app development platform. Prior to 1.11.2, Dify is vulnerable to a stored XSS issue when rendering Mermaid diagrams within chats. This occurs because Dify’s default Mermaid configuration uses securityLevel: loose, which allows potentially unsafe content to execute. This...

CVE-2026-21866

Dify is an open-source LLM app development platform. Prior to 1.11.2, Dify is vulnerable to a stored XSS issue when rendering Mermaid diagrams within chats. This occurs because Dify’s default Mermaid configuration uses securityLevel: loose, which allows potentially unsafe content to execute. This...

EUVD-2026-9325

Dify is an open-source LLM app development platform. Prior to 1.11.2, Dify is vulnerable to a stored XSS issue when rendering Mermaid diagrams within chats. This occurs because Dify’s default Mermaid configuration uses securityLevel: loose, which allows potentially unsafe content to execute. This...

CVE-2026-21866

Dify (open-source LLM app platform) is affected by a stored XSS in Mermaid rendering prior to version 1.11.2 due to securityLevel: loose; this may allow execution of unsafe content in chats. The issue is fixed in 1.11.2. CVSS v4 base score 5.1 (Medium); attack vector NETWORK, low attack complexit...

CVE-2025-68669 5ire vulnerable to Remote Code Execution (RCE) via mermaid

5ire is a cross-platform desktop artificial intelligence assistant and model context protocol client. In versions 0.15.2 and prior, an RCE vulnerability exists in useMarkdown.ts, where the markdown-it-mermaid plugin is initialized with securityLevel: 'loose'. This configuration explicitly permits...