HTML injection in Jupyter Notebook and JupyterLab leading to DOM Clobbering

ImpactThe vulnerability depends on user interaction by opening a malicious notebook with Markdown cells, or Markdown file using JupyterLab preview feature.A malicious user can access any data that the attacked user has access to as well as perform arbitrary requests acting as the attacked user...

PYSEC-2026-1707 JupyterLab vulnerable to SXSS in Markdown Preview

Impact The vulnerability depends on user interaction by opening a malicious notebook with Markdown cells, or Markdown file using JupyterLab preview feature. A malicious user can access any data that the attacked user has access to as well as perform arbitrary requests acting as the attacked user...

CVE-2026-54025 LibreChat: Stored XSS via unescaped image alt text in markdown artifact preview

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, there is a vulnerability in LibreChat's markdown artifact preview pipeline. The marked library v15.0.12 does not HTML-escape double-quote characters in image alt text when a custom renderer falls throu...

EUVD-2026-39463

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, there is a vulnerability in LibreChat's markdown artifact preview pipeline. The marked library v15.0.12 does not HTML-escape double-quote characters in image alt text when a custom renderer falls throu...

CVE-2026-54025

LibreChat suffers a stored XSS in its Markdown artifact preview prior to version 0.8.4-rc1. The vulnerability arises because lib re uses marked v15.0.12 to render image alt text without HTML-escaping double quotes when the custom image renderer defers to the default renderer. LibreChat’s generate...

PT-2026-52491

Name of the Vulnerable Software and Affected Versions LibreChat versions prior to 0.8.4-rc1 Description A flaw exists in the markdown artifact preview pipeline. The generateMarkdownHtml function located in client/src/utils/markdown.ts utilizes a custom image renderer that triggers a fallback to t...

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...

CVE-2026-54011 Open WebUI: Stored XSS in Mermaid Markdown Preview

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...

CVE-2026-54011 Open WebUI: Stored XSS in Mermaid Markdown Preview

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...

CVE-2026-54011

Open WebUI vulnerability CVE-2026-54011 is a stored XSS in Mermaid Markdown Preview. Affected versions include main and 0.8.12; the Mermaid rendering uses securityLevel: 'loose' and injects SVG via innerHTML in the file preview path, enabling JavaScript execution in the app origin. The issue is c...

Open WebUI: Stored XSS in Mermaid Markdown Preview

Summary 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 paylo...

Cross-site Scripting (XSS)

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Cross-site Scripting XSS in the Markdown file preview process when rendering Mermaid blocks with a permissive security configuration. An attacker can execute arbitrary JavaScript in the context of the victim'...

CVE-2026-11422

Markdown Preview Enhanced 0.8.x with crossnote engine 0.9.28 contains a code injection vulnerability in the WaveDrom rendering pipeline that allows attackers to execute arbitrary JavaScript by embedding malicious content in a wavedrom fenced code block within a crafted Markdown document. Attacker...

CVE-2026-49493

Markdown Preview Enhanced before 0.8.28 parses Bitfield fenced code blocks with interpretJS, which evaluates the block content as code via vm.runInNewContext, allowing arbitrary code execution. A crafted markdown document containing a malicious bitfield code block executes attacker-controlled cod...

CVE-2026-49492

Markdown Preview Enhanced before 0.8.28 opens external files and links from the preview through a shell and does not validate untrusted inputs taken from the markdown document - the diagram filename attribute, imported file paths, and the latexengine code-chunk attribute. On Windows, a crafted...

CVE-2026-50733

Markdown Preview Enhanced before 0.8.28 parses WaveDrom diagrams by evaluating untrusted markdown content with eval, allowing arbitrary JavaScript execution. The flaw affects every render path - the live preview window.eval and presentation mode plus HTML export the bundled WaveDrom.ProcessAll/ev...

CVE-2026-11422

Markdown Preview Enhanced 0.8.x with crossnote engine 0.9.28 contains a code injection vulnerability in the WaveDrom rendering pipeline that allows attackers to execute arbitrary JavaScript by embedding malicious content in a wavedrom fenced code block within a crafted Markdown document. Attacker...

CVE-2026-11422 Markdown Preview Enhanced 0.8.x Code Injection via WaveDrom Rendering

Markdown Preview Enhanced 0.8.x with crossnote engine 0.9.28 contains a code injection vulnerability in the WaveDrom rendering pipeline that allows attackers to execute arbitrary JavaScript by embedding malicious content in a wavedrom fenced code block within a crafted Markdown document. Attacker...

CVE-2026-11422

Markdown Preview Enhanced 0.8.x with crossnote engine 0.9.28 contains a code injection vulnerability in the WaveDrom rendering pipeline that allows attackers to execute arbitrary JavaScript by embedding malicious content in a wavedrom fenced code block within a crafted Markdown document. Attacker...

EUVD-2026-34916

Markdown Preview Enhanced 0.8.x with crossnote engine 0.9.28 contains a code injection vulnerability in the WaveDrom rendering pipeline that allows attackers to execute arbitrary JavaScript by embedding malicious content in a wavedrom fenced code block within a crafted Markdown document. Attacker...