CVE-2026-54067
CriticalCVSS 9.9Exploitation Probability (EPSS)
Low risk22th percentile — higher than 22% of all known CVEs
Summary
SiYuan is an open-source personal knowledge management system. Prior to version 3.7.0, a CSS snippet body containing </style> breaks out of its surrounding <style> tag, allowing arbitrary JavaScript execution in the renderer. On Electron desktop builds, the renderer runs with nodeIntegration:true, enabling access to require('child_process') from the injected handler, leading to remote code execution (RCE).
Risk Assessment
An attacker with write access to the workspace repository can plant a malicious payload that triggers on every syncing device, posing a significant security risk to the organization.
Recommendation
It is recommended to upgrade to version 3.7.0 or later to mitigate this vulnerability. Additionally, access to workspace repositories should be restricted to trusted users only.
Original NVD description (English source)
SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, CSS snippet body containing </style> breaks out of its surrounding <style> tag when renderSnippet() interpolates it via insertAdjacentHTML. A payload like runs arbitrary JavaScript in the renderer. On Electron desktop builds the renderer runs with nodeIntegration:true, so require('child_process') is reachable from the injected handler and the XSS chains to host RCE. Snippets sync via the workspace repository, so an attacker with write access to any synced workspace plants the payload once and it fires on every device that pulls. The bug also bypasses the user's enabledCSS / enabledJS separation. A user who turned enabledJS off was making a deliberate call not to run untrusted JavaScript; the CSS path runs it anyway. This vulnerability is fixed in 3.7.0.