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CVE-2026-49449

2.5 · LOW

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks.

Published Sep 21, 2026CWE-200EPSS 0.20%

Overview

CVE-2026-49449 is a low-severity vulnerability. It was published on September 21, 2026 and has a CVSS 3.1 base score of 2.5 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/laurent22/joplin/commit/b15472bc9654a72101b34b79c9436b3d450e2c10GitHubgithub.com/laurent22/joplin/pull/15538GitHubgithub.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3GitHubgithub.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-49449?

CVE-2026-49449 is a low-severity vulnerability. It was published on September 21, 2026 and has a CVSS 3.1 base score of 2.5 (LOW).

How severe is CVE-2026-49449?

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-49449?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-49449?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-49449 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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