CVE-2026-111059
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
ProductMercury
PublishedOct 19, 2026
First seenOct 19, 2026
Weakness typeCWE-79Cross-site scripting (XSS)CWE-116CWE-116
How to fix
Update
- mercury3.2.11 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mercuryPyPI | 3.0.0 ≤ v < 3.2.11 | 3.2.11 |
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