CVE-2026-53580 Trilium arbitrary file read and denial of service via file:// URLs in the automatic image-download feature
Authenticated users can read arbitrary local files or crash the server via file:// URLs in image tags due to lack of path validation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-53580?
CVE-2026-53580 is a high-severity path traversal vulnerability in TriliumNext Trilium, published on 27 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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
Which versions are affected by CVE-2026-53580?
It affects 1 product.
Products include Triliumnotes Trilium.
How do I fix CVE-2026-53580?
No fix has been published for CVE-2026-53580 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-53580 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53580 exists.
Other vulnerabilities in TriliumNext Trilium
- CVE-2026-48996 Trilium: Malicious import with GeoMap marker title XSS leads to RCE on the desktop client
- CVE-2026-53578 Trilium: Note Import to RCE via Mind Elixir dangerouslySetInnerHtml
- CVE-2026-53579 Trilium: Note Import to RCE via Book Note
- CVE-2026-47727 Code injection in Trilium
- CVE-2026-77438 Trilium unauthenticated share-search discloses password-protected and hidden shared notes
Sources
Also known as GHSA-3gxr-j6g6-q75c.