# CVE-2026-91021

## Summary

- **CVE ID:** CVE-2026-91021
- **Severity:** MEDIUM
- **CVSS Score:** 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)
- **CWE:** N/A
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 14, 2026

## 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

- Trilium — Trillium Notes (0)

## References

- [CNA](https://vokecyber.com/research/trilium-share-renderer-stored-xss)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._