Vulnerability · Published Sep 14, 2026 · Assigned by certcc

CVE-2026-91021CVE-2026-91021

Medium 5.4

In plain English

A medium-severity cross-site scripting in Trillium Notes from Trilium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 86.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Trilium Notes, version v0.103.0 and earlier, contains a stored cross-site scripting (XSS) vulnerability in the share renderer for webView notes due to improper HTML escaping of user-controlled #webViewSrc values. This vulnerability allows attackers with note-authoring privileges to inject arbitrary JavaScript that executes for any user who opens the shared note, including administrators.

Affected products (as reported)

Vendor	Product	Versions
Trilium	Trillium Notes	0 – through v0.103.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

https://vokecyber.com/research/trilium-share-renderer-stored-xss