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Vulnerability
CVE-2026-54067 is a critical stored Cross-Site Scripting (XSS) vulnerability in the SiYuan note-taking application that can lead to Remote Code Execution (RCE) on Electron desktop builds. The flaw resides in the `renderSnippet()` function, located in `app/src/config/util/snippets.ts` at line 32.
When a user enables CSS snippets (enabledCSS: true), the application fetches snippet content from the backend via the `/api/snippet/getSnippet` endpoint and inserts it directly into a `
` into a CSS snippet. When the renderer processes this snippet, the presence of `
` prematurely closes the surrounding `
` within the snippet content, which closes the parent `
` or other dangerous patterns.
enabledCSS: false) or disable Node.js integration in the Electron configuration (nodeIntegration: false).Impact
- Stored XSS to RCE: On Electron desktop builds, the XSS vulnerability escalates to full Remote Code Execution, allowing an attacker to run arbitrary commands on the host system.
- Cross-Platform XSS: Mobile and Docker web builds are also vulnerable to XSS, though the RCE vector is limited to the Electron environment.
- Automatic Propagation: The payload executes automatically whenever the renderer refreshes snippets: on application boot, manual reload, or via WebSocket push. No user interaction is required beyond having the application open.
- Workspace-Write Exposure: Any user with write access to a synchronized workspace (e.g., via compromised SiYuan Cloud, S3, WebDAV credentials, or shared filesystems) can plant the payload.
- Bypass of Security Settings: The vulnerability bypasses the user’s `enabledJS` setting. A user who disabled JavaScript for security reasons remains vulnerable because the attack is delivered through the CSS path.
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Sources:
Reported By: github.com
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