CVE-2026-91021

5.4 mediumEPSS 0.2%

Medium (5.4). EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-09-14
Modified: 2026-09-16
Record from: the NVD, synced 2026-10-19

References

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

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