SB2025043047 - Path traversal in Joplin Server

Description

This security bulletin contains information about 1 vulnerability.

1) Path traversal (CVE-ID: CVE-2025-27409)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to path traversal in the findLocalFile function in the default route when handling static file paths beginning with css/pluginAssets or js/pluginAssets. A remote attacker can send a specially crafted request to disclose sensitive information.

The issue can be exploited to read files outside the intended directories.

Remediation

Install update from vendor's website.

References

• https://github.com/laurent22/joplin/security/advisories/GHSA-5xv6-7jm3-fmg5
• https://github.com/laurent22/joplin/blob/cfbded00e25598e4fd03dee65d5289137ae05d49/packages/server/src/routes/default.ts#L35