siyuan-note SiYuan up to 3.8.3 Card Manager viewCards.ts cross site scripting

Summaryinfo

A vulnerability categorized as problematic has been discovered in siyuan-note SiYuan up to 3.8.3. This affects an unknown part of the file app/src/card/viewCards.ts of the component Card Manager. Executing a manipulation can lead to cross site scripting. This vulnerability appears as CVE-2026-100641. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in siyuan-note SiYuan up to 3.8.3. This vulnerability affects an unknown functionality of the file app/src/card/viewCards.ts of the component Card Manager. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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 <img src=invalid onerror=...> 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.

The advisory is available at github.com. This vulnerability was named CVE-2026-100641 since 09/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are necessary for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

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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