CVE-2026-39310 Trilium Notes: Authentication Bypass in Clipper API for Electron (Desktop) Builds
Attackers on shared networks can bypass authentication in Trilium Desktop's Clipper API to access notes and compromise the system.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39310?
CVE-2026-39310 is a high-severity authentication bypass vulnerability in TriliumNext Trilium, published on 20 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-39310?
How do I fix CVE-2026-39310?
No fix has been published for CVE-2026-39310 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-39310 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39310 exists.
Sources
Also known as GHSA-jcvx-vc83-cppw.