---
cve: "CVE-2026-49449"
severity: "LOW"
cvss: 2.5
epss: "0.1%"
vendor: "laurent22"
kev: false
exploited: false
published: "2026-09-21 21:17:03"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-25T01:12:19+02:00"
---

# CVE-2026-49449

> 2.5 LOW · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Erforderlich | good |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- b15472bc9654a72101b34b79c9436b3d450e2c10 (Commit)

## Referenzen

- <https://github.com/laurent22/joplin/security/advisories/GHSA-9m2r-pv96-jxr3>
- <https://github.com/laurent22/joplin/pull/15538>
- <https://github.com/laurent22/joplin/commit/b15472bc9654a72101b34b79c9436b3d450e2c10>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-49449) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_