{"id":"CVE-2026-49449","title":"Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks","summary":"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 au…","severity":"low","cvss":2.5,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","cwe":["CWE-200","CWE-522","CWE-829"],"vendor":"laurent22","product":"joplin","affected":["joplin >= 1.4.0, < 3.7.2"],"published":"2026-09-21","updated":"2026-09-28","sourceUpdated":"2026-09-28T21:17:17.913","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-49449","references":[{"url":"https://github.com/laurent22/joplin/commit/b15472bc9654a72101b34b79c9436b3d450e2c10","label":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/pull/15538","label":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3","label":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-28T20:15:08.128891Z"},"ingestedAt":"2026-09-21T21:53:57.416Z","epss":0.00196,"epssPercentile":0.09255,"slug":"CVE-2026-49449","body":"## Overview\n\nJoplin 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":26,"depthScoreParts":{"impact":13.8,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":212143,"id":"CVE-2026-49449","ts":1790630490212,"field":"exploit_available","old":"false","new":"true"}]}