laurent22 Joplin up to 3.6.14/3.7.1 Synchronization BaseItem.unserialize input validation

Summaryinfo

A vulnerability identified as critical has been detected in laurent22 Joplin up to 3.6.14/3.7.1. Affected by this issue is the function BaseItem.unserialize of the component Synchronization. This manipulation causes input validation. This vulnerability is tracked as CVE-2026-49453. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in laurent22 Joplin up to 3.6.14/3.7.1. Affected by this vulnerability is the function BaseItem.unserialize of the component Synchronization. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-49453 since 05/30/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available.

Upgrading to version 3.6.15 or 3.7.2 eliminates this vulnerability.

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Productinfo

Vendor

• laurent22

Name

• Joplin

Version

• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3
• 3.6.4
• 3.6.5
• 3.6.6
• 3.6.7
• 3.6.8
• 3.6.9
• 3.6.10
• 3.6.11
• 3.6.12
• 3.6.13
• 3.6.14
• 3.7.0
• 3.7.1

Website

• Product: https://github.com/laurent22/joplin/

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