CVE-2026-22810 Joplin: Path traversal in OneNote importer allows overwriting arbitrary files
Attackers can overwrite arbitrary files via malicious OneNote imports due to unsanitized filenames in Joplin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-22810?
CVE-2026-22810 is a high-severity path traversal vulnerability in laurent22 joplin, published on 18 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-24
Which versions are affected by CVE-2026-22810?
2 open source packages ship an affected version, including @joplin/onenote-converter. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
@joplin/onenote-converter npm | All versions | 3.5.7 |
@joplin/onenote-converter npm | All versions | 3.5.7 |
Products include Joplinapp Joplin, Msiemens One2html.
How do I fix CVE-2026-22810?
Upgrade @joplin/onenote-converter to 3.5.7 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-22810 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22810 exists.
Other vulnerabilities in laurent22 joplin
Sources
Also known as GHSA-gcmj-c9gg-9vh6.