Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
🔴 SiYuan, #CSS Snippet Style Breakout XSS to RCE, #CVE-2026-54067 (Critical) -DC-Jul2026-860 https://dailycve.com/siyuan-css-snippet-style-breakout-xss-to-rce-cve-2026-54067-critical-dc-jul2026-860/
Post summary
A new critical vulnerability (CVE‑2026‑54067) in SiYuan allows a CSS‑snippet style breakout that escalates from XSS to RCE, with no current evidence of exploitation or patches in the provided text.