CVE-2026-39310
Trilium Notes: Authentication Bypass in Clipper API for Electron (Desktop) Builds
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.
INFO
Published Date :
May 20, 2026, 8:16 p.m.
Last Modified :
July 23, 2026, 12:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update Trilium Notes to version 0.102.2 or later.
- Ensure authentication middleware is enabled for Clipper API.
- Restrict network access to the Trilium application.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-39310.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-39310 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-39310
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-39310 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-39310 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: Trilium de TriliumNext, Description: Trilium Notes es una aplicación de toma de notas jerárquica y multiplataforma centrada en la construcción de grandes bases de conocimiento personales. En las versiones 0.102.1 y anteriores, la API Clipper en Trilium Desktop (v0.101.3) permite una omisión completa de la autenticación cuando se ejecuta en un entorno Electron. Cuando Trilium detecta un entorno Electron, deshabilita explícitamente el middleware de autenticación para la API Clipper, exponiendo puntos finales como /api/clipper/notes a la red sin contraseña, token de API o protección CSRF. Un atacante en una red compartida (por ejemplo, una LAN corporativa o Wi-Fi pública) puede escanear en busca de puertos abiertos de alto rango utilizando una herramienta como nmap, ya que Trilium a menudo se enlaza a puertos como el 37840. Una vez que se encuentra un puerto candidato, una solicitud no autenticada al punto final de handshake de Clipper, que también omite la autenticación, confirma una instancia de Trilium al devolver el nombre de la aplicación y la versión del protocolo. Esto facilita el acceso no autorizado a datos, el phishing y el compromiso del sistema local. El problema ha sido solucionado en la versión 0.102.2. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'TriliumNext', 'product': 'Trilium', 'versions': [{'status': 'affected', 'version': '< 0.102.2'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-39310', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-21T12:51:29.010426Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 21, 2026
Action Type Old Value New Value Added Reference https://github.com/TriliumNext/Trilium/security/advisories/GHSA-jcvx-vc83-cppw -
New CVE Received by [email protected]
May. 20, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L Added CWE CWE-284 Added CWE CWE-306 Added Reference https://github.com/TriliumNext/Trilium/releases/tag/v0.102.2 Added Reference https://github.com/TriliumNext/Trilium/security/advisories/GHSA-jcvx-vc83-cppw