rootpwn

high · CVSS v3 7.7

CVE-2026-55105

Joplin note‑taking app is vulnerable to cross‑site scripting via Fountain rendering. Malicious Fountain code blocks can execute scripts in d

Overview

Joplin note‑taking app is vulnerable to cross‑site scripting via Fountain rendering. Malicious Fountain code blocks can execute scripts in desktop, mobile, or server‑published notes. The issue is fixed in versions 3.6.15 and 3.7.2.

Description

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.6.15 and 3.7.2, packages/renderer/MdToHtml/rules/fountain.ts passes HTML generated by the vendored fountain.js renderer into note output without sanitizing it. A malicious Fountain code block can therefore execute script when Fountain rendering is enabled in desktop or mobile clients, or when a note is published through Joplin Server where Fountain rendering is enabled by default. The script can read content subsequently loaded in the reused note viewer or, when published notes are served from the same domain as server content, access data available to an authenticated browser in the server origin. This issue is fixed in versions 3.6.15 and 3.7.2.

Impact

Confidentiality: attacker can read note content; Integrity: attacker can modify displayed content; Availability: minimal. Impacted users are those running Joplin desktop, mobile, or server with Fountain rendering enabled.

Remediation

Upgrade to Joplin 3.6.15 or 3.7.2 (or later). If upgrade not possible, disable Fountain rendering in client settings or server configuration. Verify that notes are sanitized before rendering.

Risk context

Severity high (CVSS 7.7). No EPSS data available. Patch is available, so remediation should be prioritized.

Affected products

  • Joplin Desktop
  • Joplin Mobile
  • Joplin Server

Scores

Severity
high
CVSS v2
6.8
CVSS v3
7.7
CVSS v4
—
EPSS
—

XSS Joplin Fountain Desktop Mobile Server HighSeverity

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