laurent22 joplin up to 3.3.2 findLocalFile path traversal

Summaryinfo

A vulnerability classified as critical was found in laurent22 joplin up to 3.3.2. This impacts the function findLocalFile. Such manipulation leads to path traversal. This vulnerability is documented as CVE-2025-27409. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in laurent22 joplin up to 3.3.2. It has been rated as critical. Affected by this issue is the function findLocalFile. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. CVE summarizes:

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. Prior to version 3.3.3, path traversal is possible in Joplin Server if static file path starts with `css/pluginAssets` or `js/pluginAssets`. The `findLocalFile` function in the `default route` calls `localFileFromUrl` to check for special `pluginAssets` paths. If the function returns a path, the result is returned directly, without checking for path traversal. The vulnerability allows attackers to read files outside the intended directories. This issue has been patched in version 3.3.3.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-27409 since 02/24/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 3.3.3 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• laurent22

Name

• joplin

Version

• 3.3.0
• 3.3.1
• 3.3.2

Website

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

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