CVE-2026-105783 Joplin Web Clipper pairing allows cross-origin theft of a permanent API token
Attackers can steal permanent API tokens via cross-origin requests if the Web Clipper server is enabled, granting full access to user notes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-105783?
CVE-2026-105783 is a high-severity vulnerability in laurent22 joplin, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, 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 3.7.13, when Joplin Desktop is running with the opt-in Web Clipper server enabled, the server in packages/lib/ClipperServer.ts sends Access-Control-Allow-Origin: * and allows an arbitrary website to call POST /auth and GET /auth/check because the pairing endpoints do not reject HTTP or HTTPS origins. The desktop confirmation dialog does not identify the requesting origin, so a victim who approves the generic prompt authorizes the attacking page, which then receives the permanent API token. The token provides ongoing read and write access to notes, folders, tags, resources, and master keys. This issue is fixed in version 3.7.13.
Which versions are affected by CVE-2026-105783?
How do I fix CVE-2026-105783?
No fix has been published for CVE-2026-105783 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-105783 being exploited?
There is no known exploitation of CVE-2026-105783 in the wild and no public exploit code.
Sources
Also known as GHSA-9728-v7ww-mxjv.