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[ CVE-2026-111059 · Published 19 Oct 2026 ]

Mercury: Stored / DOM Cross-Site Scripting (XSS): mr.Markdown renders untrusted content as raw, unsanitized HTML

CVSS 6.1 EPSS <1%Fix available

[ Description ]Official description

Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards. From 3.0.0 until 3.2.11, mr.Markdown converts attacker-controlled Markdown to HTML without sanitizing raw HTML before assigning it to an ipywidgets.HTML sink. Event-handler attributes and other active HTML can therefore reach the DOM and execute when another user views the application. This issue is fixed in version 3.2.11.

[ Fixes ]Fixes and patches

  • mercury 3.2.11Fixed version · GitHub Advisories · pip package mercury: upgrade to 3.2.11 or later (affected >= 3.0.0, < 3.2.11)

[ Packages ]Affected open-source packages

[ References ]References