---
id: CVE-2026-49449
title: >-
  Joplin is an open source note-taking and to-do application that organises
  notes and lists into notebooks
summary: >-
  Joplin is an open source note-taking and to-do application that organises
  notes and lists into notebooks. From 1.4.0 until 3.7.2,
  packages/renderer/MdToHtml/rules/katex.ts enables KaTeX's trust option for
  note content, allowing a note au…
severity: low
cvss: 2.5
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N'
cwe:
  - CWE-200
  - CWE-522
  - CWE-829
vendor: laurent22
product: joplin
affected:
  - 'joplin >= 1.4.0, < 3.7.2'
published: '2026-09-21'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:30:42.573'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-49449'
references:
  - url: >-
      https://github.com/laurent22/joplin/commit/b15472bc9654a72101b34b79c9436b3d450e2c10
    label: security-advisories@github.com
  - url: 'https://github.com/laurent22/joplin/pull/15538'
    label: security-advisories@github.com
  - url: >-
      https://github.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00127
epssPercentile: 0.02672
ingestedAt: '2026-09-21T21:53:57.416Z'
---

## Overview

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. From 1.4.0 until 3.7.2, packages/renderer/MdToHtml/rules/katex.ts enables KaTeX's trust option for note content, allowing a note author to place a \href URL into rendered output without passing Joplin's normal URL allowlist. On Windows, clicking a link whose target is an attacker-controlled UNC path causes pathExists() to initiate SMB authentication and disclose the current user's NTLMv2 challenge-response without a warning. The unfiltered URL can also invoke other registered URL handlers, but the credential disclosure through KaTeX \href is the distinguishing demonstrated impact. This issue is fixed in version 3.7.2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.