CVE-2026-49453: LAURENT22 Joplin

High severity, CVSS 7.0. EPSS: 0.4% chance of exploitation in the next 30 days.

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, Joplin accepts synchronized resource metadata whose id or file_extension contains parent-directory or path-separator characters. BaseItem.unserialize() stores the unvalidated fields, resourceFilename() concatenates them into a destination path, and ResourceFetcher writes the attacker-controlled resource blob outside the resource directory during background synchronization. An attacker with write access to a configured sync target or shared notebook can create or overwrite files at an attacker-chosen existing path without user interaction. This issue is fixed in versions 3.6.15 and 3.7.2.

Affected products

• LAURENT22 Joplin: before 3.6.15 (fixed in 3.6.15); from 3.7.0, before 3.7.2 (fixed in 3.7.2)

Published 2026-09-21. Last modified 2026-09-23.