CVE-2026-59815 Joplin: Pending share recipients can write items into shared folders before accepting invitations
An authenticated user with a pending share invitation can inject content into shared folders before accepting the invitation, affecting Joplin Server users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-59815?
CVE-2026-59815 is a medium-severity missing authorization vulnerability in laurent22 joplin, published on 21 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.7, Joplin Server's ItemModel.checkIfAllowed() authorizes writes to items with a share ID when any share_users row exists for the caller, without requiring ShareUserStatus.Accepted. A low-privileged authenticated user with a pending folder-share invitation can create an item under the share ID, and ShareModel.updateSharedItems3() propagates the injected content to the owner and accepted participants before the attacker accepts the invitation. This issue is fixed in version 3.7.7.
Weakness: CWE-863
Which versions are affected by CVE-2026-59815?
How do I fix CVE-2026-59815?
No fix has been published for CVE-2026-59815 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-59815 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59815 exists.
Sources
Also known as GHSA-qq59-gg3w-pf7v.