laurent22 Joplin up to 3.7.1 Renderer katex.ts pathExists information disclosure

Summaryinfo

A vulnerability was found in laurent22 Joplin up to 3.7.1. It has been declared as problematic. This impacts the function pathExists of the file packages/renderer/MdToHtml/rules/katex.ts of the component Renderer. Executing a manipulation can lead to information disclosure. The identification of this vulnerability is CVE-2026-49449. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in laurent22 Joplin up to 3.7.1. It has been declared as problematic. This vulnerability affects the function pathExists of the file packages/renderer/MdToHtml/rules/katex.ts of the component Renderer. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-49449 since 05/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 3.7.2 eliminates this vulnerability.

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Productinfo

Vendor

• laurent22

Name

• Joplin

Version

• 3.7.0
• 3.7.1

Website

• Product: https://github.com/laurent22/joplin/

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