TriliumNext Trilium up to 0.102.1 Clipper API /api/clipper/notes access control

Summaryinfo

A vulnerability marked as critical has been reported in TriliumNext Trilium up to 0.102.1. This affects an unknown part of the file /api/clipper/notes of the component Clipper API. The manipulation leads to access control. This vulnerability is traded as CVE-2026-39310. Access to the local network is required for this attack to succeed. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in TriliumNext Trilium up to 0.102.1. It has been rated as critical. This issue affects an unknown code of the file /api/clipper/notes of the component Clipper API. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Trilium Notes is a cross-platform, hierarchical note taking application focused on building large personal knowledge bases. In versions 0.102.1 and prior, the Clipper API in Trilium Desktop (v0.101.3) allows full authentication bypass when running in an Electron environment. When Trilium detects an Electron environment, it explicitly disables authentication middleware for the Clipper API, exposing endpoints such as /api/clipper/notes to the network with no password, API token, or CSRF protection. An attacker on a shared network (for example, a corporate LAN or public Wi-Fi) can scan for open high-range ports using a tool like nmap, since Trilium often binds to ports such as 37840. Once a candidate port is found, an unauthenticated request to the Clipper handshake endpoint, which also bypasses authentication, confirms a Trilium instance by returning the application name and protocol version. This facilitates unauthorized data access, phishing, and local system compromise. The issue has been fixed in version 0.102.2.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-39310 since 04/06/2026. The exploitation is known to be easy. The attack needs to be initiated within the local network. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 0.102.2 eliminates this vulnerability.

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Productinfo

Vendor

• TriliumNext

Name

• Trilium

Version

• 0.102.0
• 0.102.1

Website

• Product: https://github.com/TriliumNext/Trilium/

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