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CVE-2026-111059— Mercury: Stored / DOM Cross-Site Scripting (XSS): mr.Markdown renders untrusted content as raw, unsanitized HTML

Quick assessment

Affected
mljar mercury
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mercury 是一个用于将 Jupyter Notebook 共享为 Web 应用和仪表板的 Python 框架。在 3.0.0 至 3.2.11 版本中，mr.Markdown 会将攻击者控制的 Markdown 转换为 HTML，但在将其赋值给 ipywidgets.HTML 输出目标之前，未对原始 HTML 进行净化处理。因此，事件处理器属性及其他可执行 HTML 内容能够进入 DOM，并在其他用户查看该应用时执行。该问题已在 3.2.11 版本中修复。

CVSS 6.1 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
mljar mercury >= 3.0.0, < 3.2.11 affected
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I. Basic Information for CVE-2026-111059

Vulnerability Information
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Vulnerability Title
Mercury: Stored / DOM Cross-Site Scripting (XSS): mr.Markdown renders untrusted content as raw, unsanitized HTML
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mljar mercury >= 3.0.0, < 3.2.11 -

II. Public POCs for CVE-2026-111059

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III. Intelligence Information for CVE-2026-111059

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Other References for CVE-2026-111059 (3)

Same Patch Batch · mljar · 2026-10-19 · 3 CVEs total

CVE-2026-111057 10.0 CRITICAL Mercury: Unauthenticated Remote Code Execution in /api/terminals - access control bypass
CVE-2026-111058 9.8 CRITICAL Mercury: Unauthenticated Remote Code Execution via /api/kernels

IV. Related Vulnerabilities

Same product: mercury
Same vendor: mljar
Same weakness: CWE-79

V. Comments for CVE-2026-111059

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