Vulnerability Description
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.
CVSS Score
LOW
Related Weaknesses (CWE)
References
- https://github.com/laurent22/joplin/commit/b15472bc9654a72101b34b79c9436b3d450e2
- 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
FAQ
What is CVE-2026-49449?
CVE-2026-49449 is a vulnerability with a CVSS score of 2.5 (LOW). 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...
How severe is CVE-2026-49449?
CVE-2026-49449 has been rated LOW with a CVSS base score of 2.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-49449?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.