CVE-2026-91021
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
ProductTrillium Notes
PublishedSep 14, 2026
First seenSep 14, 2026
Weakness typeCWE-79Cross-site scripting (XSS)CWE-116CWE-116
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Trilium Trillium Notes | v ≤ v0.103.0 | — |
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