CVE-2026-49450 Code injection in joplin
Attackers can execute arbitrary code by supplying a maliciously signed or unsigned update installer due to missing publisher verification in the auto-updater.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-49450?
CVE-2026-49450 is a high-severity code injection vulnerability in laurent22 joplin, published on 21 Sep 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. Prior to 3.7.2, Joplin Desktop for Windows omits publisherName from packages/app-desktop/package.json, so the generated app-update.yml causes NsisUpdater.verifySignature() to skip comparison of a downloaded update's Authenticode signer with Joplin's signer. An attacker who controls the update delivery path can replace the update metadata and installer, and the client accepts an installer signed by another publisher or left unsigned after the user approves installation. Successful exploitation runs attacker-controlled code with the user's privileges and can compromise notes, credentials, and local data. This issue is fixed in version 3.7.2.
Which versions are affected by CVE-2026-49450?
How do I fix CVE-2026-49450?
No fix has been published for CVE-2026-49450 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-49450 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49450 exists.
Sources
Also known as GHSA-9wp7-hr9m-3273.