CVE-2026-55105

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.6.15 and 3.7.2, packages/renderer/MdToHtml/rules/fountain.ts passes HTML generated by the vendored fountain.js renderer into note output without sanitizing it. A malicious Fountain code block can therefore execute script when Fountain rendering is enabled in desktop or mobile clients, or when a note is published through Joplin Server where Fountain rendering is enabled by default. The script can read content subsequently loaded in the reused note viewer or, when published notes are served from the same domain as server content, access data available to an authenticated browser in the server origin. This issue is fixed in versions 3.6.15 and 3.7.2.

• CWE-79

• https://github.com/laurent22/joplin/commit/8e0812de9d79d1f0698bb76a8c5d7e991df9748d
• https://github.com/laurent22/joplin/pull/15659
• https://github.com/laurent22/joplin/security/advisories/GHSA-f7q3-3grx-6wg9
• https://github.com/laurent22/joplin/security/advisories/GHSA-f7q3-3grx-6wg9

Published

Sep 21, 2026

Last Modified

Sep 24, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-55093Tract is a tiny, no-nonsense, self-contained TensorFlow and …6.1
• CVE-2026-55095OpenProject is open-source, web-based project management sof…5.3
• CVE-2026-55099icalendar is an RFC 5545 compatible parser and generator of …7.5
• CVE-2026-5510The GiveWP – Donation Plugin and Fundraising Platform plugin…6.4
• CVE-2026-55100hashi-vault-js is a Node.js module for interacting with the …8.7
• CVE-2026-55102hashi-vault-js is a Node.js module for interacting with the …5.8
• CVE-2026-55106authentik is an open-source identity provider. Prior to 2026…5.3
• CVE-2026-55108KubeVela is an open source application delivery platform. Pr…8.5
• CVE-2026-5511In the web management interface of Archer AX72 (SG) v1, the …2.7
• CVE-2026-55110A malicious actor who lures an authenticated user to a malic…6.1
• CVE-2026-55111A malicious actor with access to the network could exploit a…7.5
• CVE-2026-55112A malicious actor with access to the network and low privile…8.8