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CVE-2026-100641: siyuan

Severity

8.6 (HIGH)

Vendor

SIYUAN-NOTE

Affected versions

0 through before 3.8.4

Fixed version

3.8.4

Patch status

Patched

Published

2026-09-26T14:16:46.080

Modified

2026-09-26T14:16:46.193

Why it matters

This matters because the affected product may allow code execution. Prioritize systems that are internet-facing or have privileged access to other infrastructure.

Recommended admin actions

• Review and patch based on exposure, asset criticality, and business impact.
• Compare installed versions against the affected version range in the advisory.

Technical summary

SiYuan before v3.8.4 does not HTML-escape stored flashcard block content before interpolating it into the card-manager list markup. Block content returned by /api/riff/getRiffCards is inserted into a card item template in app/src/card/viewCards.ts and assigned to listElement.innerHTML, so content such as becomes an executable event-handler attribute. Because the SiYuan desktop (Electron) main window is created with nodeIntegration enabled and contextIsolation disabled, an administrator who opens the card manager on a workspace containing attacker-supplied flashcard content (for example introduced through contribution or import) executes the attacker's script in a privileged renderer, which can lead to arbitrary code execution on the host. The affected endpoint remains behind authentication and administrator-role checks; this is an untrusted-content-to-privileged-renderer issue, not an authorization bypass.

View the official NVD record for CVE-2026-100641

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.