CVE-2026-39311
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk21th percentile - higher than 21% of all known CVEs
Summary
Trilium Notes version 0.102.1 and prior contain a critical vulnerability allowing unauthenticated remote code execution (RCE). Lack of SVG sanitization combined with a disabled Content Security Policy (CSP) and a publicly reachable backend execution API allows an attacker to execute arbitrary Node.js code on the server by tricking an authenticated user into viewing a malicious SVG attachment.
Risk Assessment
The organization risks complete compromise of the Trilium Notes server, potentially leading to data theft, note modification, or further attacks on the infrastructure.
Recommendation
Immediately update Trilium Notes to version 0.102.2 or later, which includes a fix.
Original NVD description (English source)
Trilium Notes is a cross-platform, hierarchical note taking application focused on building large personal knowledge bases. Versions 0.102.1 and prior contain a critical security flaw where lack of SVG sanitization combined with a disabled Content Security Policy (CSP) and a publicly reachable backend execution API results in an unauthenticated Remote Code Execution (RCE). The vulnerability arises from an insecure-by-design architecture: Trilium serves SVG attachments with the image/svg+xml MIME type without any sanitization, and it explicitly disables Helmet's Content Security Policy middleware, removing the primary defense against script execution in served assets. Because the malicious SVG runs under the Same-Origin Policy, it can issue a fetch('/') to extract the csrfToken from the document body. With that token, it can send a signed request to /api/script/exec to execute arbitrary Node.js code on the server. An attacker can compromise the entire server instance simply by tricking an authenticated user into viewing a shared SVG attachment. The issue has been fixed in version 0.102.2.