---
id: CVE-2026-55210
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. Prior to 3.7.2, Joplin Server's
  UserModel.ssoLogin() returns an existing account matched by an IdP-asserted
  email without checking …
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-290
vendor: laurent22
product: joplin
affected:
  - joplin < 3.7.2
published: '2026-09-21'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:30:42.573'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55210'
references:
  - url: >-
      https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2
    label: security-advisories@github.com
  - url: 'https://github.com/laurent22/joplin/pull/15647'
    label: security-advisories@github.com
  - url: >-
      https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00376
epssPercentile: 0.31519
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-22T13:06:34.047429Z'
ingestedAt: '2026-09-21T21:53:57.433Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.