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2.5

Joplin note links can steal Windows credentials

CVE-2026-49449 · published 28 days ago
Summary

Versions of Joplin from 1.4.0 through 3.7.2 allow a note to include a hidden link that bypasses the app's safety checks. On Windows, clicking such a link can cause the computer to automatically send the user's authentication data to an attacker, revealing their login credentials. Updating to version 3.7.2 or later stops this behavior.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
laurent22 joplin >= 1.4.0, < 3.7.2
Original advisory text
Joplin: KaTeX `trust:true` enables URL-allowlist bypass leading to NTLMv2 credential theft via UNC path on Windows
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.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
2.5 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-200Information Exposure
CWE-522Insufficiently Protected Credentials
CWE-829Inclusion of Functionality from Untrusted Control Sphere
Timeline
Published21 Sep 2026
Updated19 Oct 2026
First seen21 Sep 2026
Sources
CVE-2026-49449 · NVD
CVE-2026-49449 · MITRE
CVE-2026-49449 · OSV
GHSA-9m2r-pv96-jxr3 · GHSA
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