Is CVE-2026-111059 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-111059?

CVE-2026-111059 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-111059

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.