CVE-2026-100634 Details
Description
SiYuan before v3.8.4 does not validate the sender or restrict recipients in the 'siyuan-send-windows' IPC handler of the Electron main process (app/electron/main.js). The handler ignores event.sender and forwards any received payload to every BrowserWindow returned by BrowserWindow.getAllWindows(), including windows belonging to other opened workspaces. A renderer connected to an attacker-controlled remote kernel can therefore send {cmd: "lockscreenByMode"} and have it delivered across the workspace boundary; a sibling workspace window whose lockScreenMode is set to 1 invokes lockScreen(). Repeated messages allow the remote workspace to repeatedly lock unrelated local workspace windows, causing a limited denial of service. No confidentiality, integrity, or code-execution impact was observed.
A vulnerability exists in SiYuan versions prior to 3.8.4, where the 'siyuan-send-windows' IPC handler in the Electron main process fails to validate the sender or restrict recipients. This handler indiscriminately forwards received payloads to all BrowserWindows, including those in different workspaces. As a result, a renderer connected to an attacker-controlled remote kernel can send a command to lock the screen, which is then executed in an unrelated local workspace, causing a limited denial-of-service. This vulnerability does not impact confidentiality, integrity, or allow code execution.
Users can update to SiYuan version 3.8.4 or later, where this vulnerability has been patched.
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 26, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/siyuan-note/siyuan/commit/8641553a1f07374001902d3ce773285db1292b2d | [email protected] | Source CodeVendor |
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-wxp7-xpq8-8xpm | [email protected] | AdvisoryExploitTechnical AnalysisVendor |
| https://www.vulncheck.com/advisories/siyuan-before-3.8.4-missing-authorization-via-siyuan-send-windows | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| SiYuan | < 3.8.4 (semver) |
CPE
Remediation
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Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 26, 2026 | New CVE Received | [email protected] |