CVE-2026-49453

Joplin: Path traversal in resource sync — silent arbitrary file write outside the resource directory

Published 21 Sep 2026 • Updated 21 Sep 2026

Severity: HIGH

Description

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 (1)

• laurent22 joplin

Problem types

• CWE-20: Improper Input Validation
• CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

References (5)

• https://github.com/laurent22/joplin/security/advisories/GHSA-r24r-gp6h-cwgf
• https://github.com/laurent22/joplin/pull/15540
• https://github.com/laurent22/joplin/pull/15672
• https://github.com/laurent22/joplin/commit/18e0b08c282c89ae51612c4eff67af2a45ff5163
• https://github.com/laurent22/joplin/commit/50518073740c4501058e366300b42c2f1925cb05