---
cve: "CVE-2026-55210"
severity: "HIGH"
cvss: 7.4
epss: "28.1%"
vendor: "laurent22"
kev: false
exploited: false
published: "2026-09-21 22:16:56"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-23T01:40:32+02:00"
---

# CVE-2026-55210

> 7.4 HIGH · 🧪 PoC

## Beschreibung

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.2, Joplin Server's UserModel.ssoLogin() returns an existing account matched by an IdP-asserted email without checking the account's is_external flag. In deployments using mixed local and SAML authentication, an attacker whose IdP session can assert a local user's email can pass POST /api/saml, receive a session for that local account, and access or modify the victim's notes, files, and settings without knowing the local password. This issue is fixed in version 3.7.2.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- d9767bd2c6558d4ef1499568cdc72d053f3329ac (Commit)

## Referenzen

- <https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5>
- <https://github.com/laurent22/joplin/pull/15647>
- <https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55210) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_