CVE-2026-49449

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.

• https://github.com/laurent22/joplin/commit/b15472bc9654a72101b34b79c9436b3d450e2c10
• https://github.com/laurent22/joplin/pull/15538
• https://github.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3
• https://github.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3