siyuan-note SiYuan up to 3.8.3 IPC app/electron/main.js lockScreen denial of service

Summaryinfo

A vulnerability classified as problematic was found in siyuan-note SiYuan up to 3.8.3. The impacted element is the function lockScreen of the file app/electron/main.js of the component IPC Handler. Such manipulation leads to denial of service. This vulnerability is listed as CVE-2026-100634. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in siyuan-note SiYuan up to 3.8.3 and classified as problematic. Affected by this issue is the function lockScreen of the file app/electron/main.js of the component IPC Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-100634 since 09/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 3.8.4 eliminates this vulnerability.

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Productinfo

Vendor

• siyuan-note

Name

• SiYuan

Version

• 3.8.0
• 3.8.1
• 3.8.2
• 3.8.3

Website

• Product: https://github.com/siyuan-note/siyuan/

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