{"id":"CVE-2026-49449","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-49449","generatedAt":"2026-10-28T04:15:11.617Z","title":"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.","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.","published":"2026-09-21T21:17:04.000Z","lastModified":"2026-09-28T21:17:18.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":2.5,"severity":"LOW","vector":"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"],"affected":[],"epss":{"score":0.00196,"percentile":0.09255,"date":"2026-10-27","history":[{"date":"2026-09-22","score":0.00127,"percentile":0.02678}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.20%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-21T21:17:04.000Z","detail":{"score":"2.5","severity":"LOW","publishedAt":"2026-09-21T21:17:03.593Z"},"summary":"New CVE, low severity (CVSS 2.5)."}],"references":[{"url":"https://github.com/laurent22/joplin/commit/b15472bc9654a72101b34b79c9436b3d450e2c10","source":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/pull/15538","source":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3","source":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-49449","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}