CVE-2026-22810: Joplin: Path traversal in OneNote importer allows overwriting arbitrary files

Vulnerability summary

CVE-2026-22810 is a high (CVSS 8.2) Path Traversal: '../filedir' vulnerability in joplinapp joplin. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.1% of scored vulnerabilities.

Timeline

1. 18-05-2026
   PublishedVulnerability first disclosed.
2. 20-05-2026
   Last modifiedVulnerability information updated.

Description

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions prior to 3.5.7 contain a path traversal vulnerability in the importer which allows overwriting arbitrary files on disk. The OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious .one file that includes file names containing ../../, that are then interpreted as part of the target path when extracting attachments from the .one file. This issue has been patched in version 3.5.7.

• CWE-24Path Traversal: '../filedir'The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize "../" sequences that can resolve to a location that is outside of that directory.