TriliumNext Trilium up to 0.103.0 Safe Import Filter cross site scripting

Summaryinfo

A vulnerability classified as problematic was found in TriliumNext Trilium up to 0.103.0. Affected is an unknown function of the component Safe Import Filter. Executing a manipulation can lead to cross site scripting. This vulnerability is registered as CVE-2026-53579. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in TriliumNext Trilium up to 0.103.0. It has been declared as problematic. This vulnerability affects an unknown function of the component Safe Import Filter. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

Trilium is an open-source hierarchical note-taking application. In versions up to and including 0.103.0, the default-on "Safe import" filter sanitizes HTML only for text notes and excludes the book note type, whose content is stored without sanitization and later rendered as HTML, allowing an attacker-supplied import archive to embed a payload that executes as script. A book note's content is routed through the same rendering path as text notes and injected into the page with jQuery's html method when the note is shown as a grid-view preview card, so a malicious note survives Safe import and runs as soon as the victim opens the containing note. On the desktop client the Electron renderer runs with Node integration enabled, so the injected JavaScript escalates from cross-site scripting to full remote code execution on the victim's machine. This issue is fixed in version 0.104.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-53579 since 06/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 0.104.0 eliminates this vulnerability.

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Productinfo

Vendor

• TriliumNext

Name

• Trilium

Version

• 0.103

Website

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

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