Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-53580

CVE-2026-53580HIGH

TriliumNext Trilium — Trilium arbitrary file read and denial of service via file:// URLs in the automatic image-download feature

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  N  H    8.1   .0052   42.9     —

AFFECTED
  Product  Versions     Fixed
  Trilium  < 0.104.0 –  —

TIMELINE
  Jun 9   Reserved by GitHub_M
  Aug 27  Published (CNA: GitHub_M)
  Oct 14  EXPLOIT PUBLISHED — CVE-2026-53580 (TriliumNext Trilium). Public exploit reference added.

CWE-73, CWE-400, CWE-552 · CNA: GitHub_M · CVSS v3.1 · 2 references · NVD status: Analyzed

Description

Trilium is an open-source hierarchical note-taking application. In versions prior to 0.104.0, the automatic image-download feature accepts file:// URLs in a note's img tags and reads the referenced local file with no path validation, allowing any authenticated user to disclose arbitrary files readable by the Trilium process. When a text note is saved, Trilium scans its HTML for image sources and downloads each external one; because the HTML sanitizer keeps file as an allowed scheme, a source such as file:///etc/passwd is passed straight to a filesystem read and its contents are stored as a note attachment the user can then retrieve. Pointing the same primitive at an unbounded source such as /dev/zero causes uncontrolled memory allocation that crashes the server process. The feature is enabled by default and is reachable through the web UI, the ETAPI, the web clipper, and note imports, requiring only an authenticated session or an ETAPI token. This issue is fixed in version 0.104.0

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 9, 2026	Reserved	Reserved by GitHub_M
August 27, 2026	Published	Published (CNA: GitHub_M)
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-53580 (TriliumNext Trilium). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
TriliumNext	Trilium	—	< 0.104.0	—

Weaknesses

CWE-73 · CWE-400 · CWE-552

References (2)

https://github.com/TriliumNext/Trilium/commit/c417c901dfe45222c321fab1685f26730cc2068f [Patch]
https://github.com/TriliumNext/Trilium/security/advisories/GHSA-3gxr-j6g6-q75c [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-53580 at cve.org

Vendors: triliumnext

Weaknesses: CWE-73 · CWE-400 · CWE-552

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-53580 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.