CVE-2026-49449

2.5 LOWpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

Summary: The flaw allows unfiltered URLs in notes to disclose NTLMv2 credentials via KaTeX's trust option, enabling attackers to exploit this through SMB authentication.
Exploitability: Exploitation requires a user to click an attacker-controlled link with specific conditions met on Windows.
Blast radius: If exploited, it could lead to credential disclosure for the current user, impacting local network security.
Prioritized remediation: Update Joplin to version 3.7.2 or later to mitigate this vulnerability.

credential-disclosuresmb-authweb-appntlm

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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 vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

Weaknesses

CWE-200, CWE-522, CWE-829

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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