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.
Metrics
Affected Vendors & Products
References
History
Mon, 28 Sep 2026 21:30:00 +0000
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ssvc
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Tue, 22 Sep 2026 19:45:00 +0000
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Laurent 22
Laurent 22 joplin |
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Laurent 22
Laurent 22 joplin |
Mon, 21 Sep 2026 21:00:00 +0000
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| 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. | |
| Title | Joplin: KaTeX `trust:true` enables URL-allowlist bypass leading to NTLMv2 credential theft via UNC path on Windows | |
| Weaknesses | CWE-200 CWE-522 CWE-829 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-09-21T20:52:11.164Z
Updated: 2026-09-28T20:15:24.088Z
Reserved: 2026-05-30T02:43:33.106Z
Link: CVE-2026-49449
Updated: 2026-09-28T20:14:51.185Z
Status : Deferred
Published: 2026-09-21T21:17:03.593
Modified: 2026-09-28T21:17:17.913
Link: CVE-2026-49449
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