CVE-2026-91021 Details
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.
A stored cross-site scripting vulnerability has been identified in Trilium Notes versions through 0.103.0. The issue arises in the share renderer for Web View notes, where user-controlled #webViewSrc values are not properly HTML-escaped. This flaw allows note authors to inject arbitrary JavaScript that executes for any user who opens the shared note, including administrators.
Users are advised to upgrade to Trilium Notes version 0.105.0 or later, where this vulnerability has been fixed. After upgrading, audit any existing Web View notes that were shared to ensure they do not contain a #webViewSrc value that could exploit this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 14, 2026CISA-ADP
Assessed Sep 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://vokecyber.com/research/trilium-share-renderer-stored-xss | [email protected] | AdvisoryExploitRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| Trilium Notes | <= v0.104.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | CVE Modified | CISA-ADP |
| Sep 14, 2026 | New CVE Received | [email protected] |