Improper access control in Joplin Server - CVE-2026-34600
Published: May 26, 2026
Vulnerability identifier: #VU132299
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34600
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Joplinapp
Affected software:
Joplin Server
Joplin Server
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper access control in the delta API and ChangeModel.delta when synchronizing shared items. A remote user can trigger synchronization after access to a shared note has been removed to disclose sensitive information.
Only instances with DELTA_INCLUDES_ITEMS enabled are vulnerable. User interaction is required to perform synchronization.
How to mitigate CVE-2026-34600
Install security update from vendor's website.