CVE-2026-46650 Joplin: Stored XSS in public share viewer via javascript: URL bypass in isAcceptedUrl
A low-privileged user can inject JavaScript into public notes via a bypassed URL check, allowing script execution in the victim's browser context.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-46650?
CVE-2026-46650 is a medium-severity cross-site scripting vulnerability in laurent22 joplin, published on 21 Sep 2026. Any signed-in user can exploit it over the 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, isAcceptedUrl() in packages/renderer/htmlUtils.ts uses an unanchored regular expression for internal resource URLs, allowing a javascript: URL containing a matching 32-character path fragment to pass validation and be emitted into an HTML note's link. A low-privileged Joplin Server user can publish the crafted HTML note as a public share. In the current build, ordinary left-click is blocked; demonstrated execution requires middle-click or Open in new tab in an older or non-hardened browser because current Chrome and Firefox block javascript: new-tab navigation. When execution succeeds, the script runs in the Joplin Server origin, can read page-visible content, and can make authenticated same-origin requests when the victim is signed in. This issue is fixed in version 3.7.2.
Weakness: CWE-79
Which versions are affected by CVE-2026-46650?
How do I fix CVE-2026-46650?
No fix has been published for CVE-2026-46650 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-46650 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46650 exists.
Sources
Also known as GHSA-x9vj-jrqf-9wcm.